Unidirectional Force Research Articles

Effects of Distributed Generation on Electrical Power Network and Protection

The energy consumption increases day by day. To meet this need, we need to increase the generation of energy. Due to this growing demand, non-renewable energy sources come into play. One of these solutions is to connect dg to the electrical network. These distribution networks are usually connected to a low voltage network. The trend of the unidirectional force flow has gradually changed. The power supply connected to the electrical network is a bidirectional current flow system. The additional energy is returned to the network. The reliability has been improved. The introduction of the DG into the conventional power supply system poses several challenges, such as: higher short circuit levels, higher load losses, lower energy quality, voltage transients, voltage stability problems, coordination problems of the voltage regulation and protection, and the protection of the system may not work properly, and due to the bidirectional power flows of the DGs, there is a lower contribution of residual current from the DGs connected to the inverters. This article examines the effects of the penetration of DG into DN and suggests possible solutions to reduce these effects. In addition, traditional protection strategies are reviewed with respect to the Dg connected to the energy system.

Stiffness properties analysis and enhancement in robotic drilling application

Low stiffness and special stiffness properties limit the application of industrial robots in sophisticated manufacturing. The subject of the paper is to investigate the influence of robot stiffness properties on machining quality in drilling application. It is found that unidirectional thrust force could induce three-directional deformation of robot which will directly lead to hole defects during drilling procedure. Firstly, starting from the special characteristics of the robot, the key role of the preload pressing force is pointed out. Equivalent stiffness model under pre-load pressing force is established and stiffness promotion coefficient is defined to evaluate the effects of pressing force quantitatively. The matching criterion of robot drilling posture and thrust force is proposed, and the optimized value of pressing force can be predicted under the condition of stable machining. Limitation on hole diameter and roundness of robot drilling is evaluated too. By applying pre-load pressing force, the stiffness of robot drilling plane is markedly improved, and the drilling stability and hole diameter accuracy are also enhanced. Finally, the proposed method is verified by drilling experiments.

Attenuation of cross-flow instability in three-dimensional boundary layer by means of multi-discharge actuator system

Results of experiments in low-turbulence subsonic wind tunnel sustaining the possibility of significant attenuation of the cross-flow velocity and the intensity of stationary instability vortices due to the body force impact on three-dimensional boundary layer are presented. The unidirectional body force over a significant area of the streamlined surface has been created with the help of dielectric barrier discharge actuator.

Attenuation of Cross-Flow Instability in a Three-Dimensional Boundary Layer by Means of a Multidischarge Actuator System

The results of experiments in a low-turbulence subsonic wind tunnel confirming the possibility of a significant attenuation of the cross-flow velocity and the intensity of instability of stationary vortices in this flow due to the body-force effect on a three-dimensional boundary layer are presented. The unidirectional body force above a significant area of the streamlined surface was generated by a multidischarge actuator based on the surface dielectric barrier discharge.

Modelling the unidirectional fibre composite milling force oscillations through capturing the influence of the stochastic fibre distributions

Although high frequency variation of cutting forces is an inherent characteristic when milling composites, studies and models on the explanation and time-domain simulation of such processing forces seem to be missing in the literature. This paper first claims that the variation of the composite milling forces comes from three aspects: i) the variation of chip thickness caused by the cycloid trajectories of the cutting edge; ii) the random fibre placements within the composite and iii) the continuous variation of the cutting direction relative to the fibre orientation due to the rotational motion of the milling cutter. Moreover, the cutter’s helix angle leads to each section of the cutting edge engaging different fibre orientations simultaneously, adding additional challenges in understanding and predicting the resultant forces. Thus, this paper develops an analytical approach which can be utilised to accurately simulate the milling forces in time domain for unidirectional fibre composites. The approach calculates the chip thickness, estimates the stochastic fibre placements and defines variable cutting coefficients for different fibre orientations to integrate their effects on the force variability. Besides, the helical cutter is discretized into several slices to simulate the force acting on each engaged part at its relevant fibre cutting angle, resulting in a procedure of simulating the composite cutting force with helical milling cutter. Both straight and helical milling cutters are taken into account to validate the model, the effects from the concluded three aspects are separately investigated to provide an in-depth understanding of the force variation and support the developed model. It is observed that the variation of milling forces follows a Gaussian distribution when the cutting direction of the fibre is fixed. Furthermore, the simulated milling forces show a satisfactory agreement with the experimental results, especially their oscillations illustrate a high degree of consistency.

β1 integrin is a sensor of blood flow direction.

ABSTRACTEndothelial cell (EC) sensing of fluid shear stress direction is a critical determinant of vascular health and disease. Unidirectional flow induces EC alignment and vascular homeostasis, whereas bidirectional flow has pathophysiological effects. ECs express several mechanoreceptors that respond to flow, but the mechanism for sensing shear stress direction is poorly understood. We determined, by using in vitro flow systems and magnetic tweezers, that β1 integrin is a key sensor of force direction because it is activated by unidirectional, but not bidirectional, shearing forces. β1 integrin activation by unidirectional force was amplified in ECs that were pre-sheared in the same direction, indicating that alignment and β1 integrin activity has a feedforward interaction, which is a hallmark of system stability. En face staining and EC-specific genetic deletion studies in the murine aorta revealed that β1 integrin is activated and is essential for EC alignment at sites of unidirectional flow but is not activated at sites of bidirectional flow. In summary, β1 integrin sensing of unidirectional force is a key mechanism for decoding blood flow mechanics to promote vascular homeostasis.This article has an associated First Person interview with the first author of the paper.

Continuous Microfluidic Pump Involving Conducting Polymer Modified Redox-Magnetohydrodynamics (R-MHD)

Continuous microfluidic pumping is an important requirement for numerous applications, such as lab-on-a-chip separation and imaging cytometry. To satisfy this necessity we have developed a strategy to indefinitely push fluid in a single direction by Redox-Magnetohydrodynamics (R-MHD). R-MHD is a phenomenon where fluid flows between electrodes by a net body force ( FB ), followed by the equation FB = j × B , where j and B are the ionic current and magnetic flux densities, respectively. 1,2 Ionic current density ( j ) converts from electronic current through the redox reaction of chemical species (K3Fe(CN)6 / K4Fe(CN)6) or electrode confined conducting polymer (CP) whereas magnetic field ( B ) comes from a permanent or electromagnet. CP, such as Poly(3,4-ethylenedioxythiophene) or PEDOT can be electropolymerized on the electrode surface with good spatial resolution, adherence, uniformity, and controlled thickness.3 These characteristics along with high electronic conductivity and capacitance have made them perfect candidates as redox center in R-MHD pumping. CP generates high ionic current density (j) in the electrolyte solution and avoids the interference issue of solution redox species.4-6 R-MHD pumping has unique advantages; such as flat flow profile, valve and channel less device, tunability, portability, circular flow capability, and low voltage requirement.6 Therefore, it is of interest in different microfluidic applications including chemical analysis, mixing, synthesis, detection, imaging cytometry and separation. To satisfy these growing needs, achieving longer pumping with a high speed is a primary requirement. Deposition parameters such as types of monomers, the number of redox centers or polymer loading, choice of deposition method, and electrolytic strength of the pumping solution affect both the current and charge density of polymer films that limits pumping speed and duration. PEDOT deposited by the potentiostatic technique, propylene carbonate solvent, and TBAPF6 electrolyte exhibited the best combination for maximum electrochemical response and mechanical stability. The improved polymer showed 80% retention of its capacity even after 500 pumping cycles.7,8 Though the optimized PEDOT film could pump for 211.70 ± 8.0 sec with a moderate 49.40 ± 6.0 µm/s fluid speed through a cross section of 760 µm × 3 mm pumping region, the fluid can only flow in one direction until the charge in the PEDOT film is consumed (discharging). Polymer film recharges by applying a reverse current but owing to have the same magnetic field orientation underneath the electrodes, the fluid flows in the reverse direction. This periodic reversed flow was useful in image cytometry application of leukocytes in post cancer monitoring.5,9 Some microfluidic applications such as on-chip separation require even longer pumping, at a high speed, and in a single direction. To address this limitation, we built a raspberry pi-controlled translational device that synchronizes magnetic field with opposite bias current. The continuous change in current bias recharges the polymer film after the initial discharge but the simultaneous position switching of two permanent magnets with opposite field directions maintains a unidirectional MHD force. This programmable R-MHD offers several advantages over AC-MHD approach, such as higher magnetic field, simplified instrumentation, and less fluidic disruption.10 Results will be reported on a newly developed smaller device where galvanostat can trigger a translational stage with opposing orientation of magnets through a single board computer so that, magnets can be switched automatically when a target voltage is reached or within a wait time (open circuit potential). References (1) Grant, K. M.; Hemmert, J. W.; White, H. S. Journal of the American Chemical Society 2002, 124, 462-467. (2) Leventis, N.; Gao, X. Analytical Chemistry 2001, 73, 3981-3992. (3) Poverenov, E.; Li, M.; Bitler, A.; Bendikov, M. Chemistry of Materials 2010, 22, 4019-4025. (4) Nash, C. K.; Fritsch, I. Analytical Chemistry 2016, 88, 1601-1609. (5) Khan, F. Z.; Hutcheson, J. A.; Hunter, C. J.; Powless, A. J.; Benson, D.; Fritsch, I.; Muldoon, T. J. Analytical Chemistry 2018, 90, 7862-7870. (6) Sahore, V.; Fritsch, I. Analytical Chemistry 2013, 85, 11809-11816. (7) Khan, F. Z.; Fritsch, I. Meeting s 2016, MA2016-01, 2064-2064. (8) Khan, F. Z.; Fritsch, I. Meeting s 2017, MA2017-01, 2017-2017. (9) Hutcheson, J. A.; Khan, F. Z.; Powless, A. J.; Benson, D.; Hunter, C.; Fritsch, I.; Muldoon, T. J. In High-Speed Biomedical Imaging and Spectroscopy: Toward Big Data Instrumentation and Management; International Society for Optics and Photonics, 2016, p 97200U. (10) Nash, C. K. The Electrochemical Society Interface 2014, 23, 79-80.

Successively accelerated ionic wind with integrated dielectric-barrier-discharge plasma actuator for low-voltage operation

Electrohydrodynamic (EHD) force is used for active control of fluid motion and for the generation of propulsive thrust by inducing ionic wind with no moving parts. We propose a method of successively generating and accelerating ionic wind induced by surface dielectric-barrier-discharge (DBD), referred to as a DBD plasma actuator with multiple electrodes. A conventional method fails to generate unidirectional ionic wind, due to the generation of a counter ionic-wind with the multiple electrodes DBD plasma actuator. However, unidirectional ionic wind can be obtained by designing an applied voltage waveform and electrode arrangement suitable for the unidirectional EHD force generation. Our results demonstrate that mutually enhanced EHD force is generated by using the multiple electrodes without generating counter ionic-wind and highlights the importance of controlling the dielectric surface charge to generate the strong ionic wind. The proposed method can induce strong ionic wind without a high-voltage power supply, which is typically expensive and heavy, and is suitable for equipping small unmanned aerial vehicles with a DBD plasma actuator for a drastic improvement in the aerodynamic performance.

Identification of sealing potential through fault seal analysis: a case study of Badin area, Lower Indus Basin, Pakistan

The sealing potential of a fault can be originated from reservoir/nonreservoir rock juxtaposition. The present study focuses on the assessment of the sealing potential of the Lower Goru Formation of Badin area, Lower Indus Basin, Pakistan. The uni-directional force is one of the causes of leakage through the upper reservoirs of Lower Goru Formation, i.e. sand A, B and C and thus made a good seal as sand D. The fault properties associated with sealing capacity and leakage are estimated using algorithms. These algorithms are based on the juxtaposition of the reservoir rock against sealing lithology, deformation and present stage of stress regime within the fault plane relative to leakage. Time and depth contour maps of top of the Lower Goru Formation represent a half-graben structure showing uni-directional force in the area. An Allan-type diagram depicted a sand-sand juxtaposition for sand A and juxtaposition of sand A with sand B, thus eliminating any chances of sealing conditions. A similar diagram confirmed shale-sand juxtaposition for sands C and D. The juxtaposition diagram referred to an increase in shale gouge ratio (SGR) values from sand A to sand D with maximum values at sand D, thus classifying good fault sealing potential at sand D. Therefore, it is confirmed that sealing capacity of the fault (F2) increases from sand A (poor seal) where SGR = 0.44% – 0.9% and shale smear factor (SSF) = 0.23 – 1 to sand D (moderate seal) where SGR = 10% – 44% and SSF = 0.05 – 0.22 which means that sand D is more sealed than any other sand in the study area.

Dynamic flow characteristics in U-type anti-high overload microfluidic inertial switch

Under the action of unidirectional inertial force, the working liquid can bear high overload and not be dispersed in the U-type connected microchannel. This structure provides the possibility for designing anti-high overload microfluidic inertial switch. Based on the designed U-type microfluidic inertial switch, the dynamic flow process of liquid in U-type microchannel under inertial force was studied to predict and evaluate the characteristic of anti-overload. The unsteady Bernoulli flow model with the effect of viscosity local resistance was derived by utilizing the undetermined factor k. The VOF and CSD modules in CFD software were employed to analyze the transient flow process, and then the factor k was obtained by the simulation results. Centrifugal test platform was utilized to measure the variation of liquid surface movement displacement. The result shows that the modified dynamic flow model can reasonably describe the flow process of liquid surface, and the oscillations frequency and amplitude of the liquid surface increase with the increase of the inertial acceleration and the cross-sectional size of the microchannel. Moreover, even under the load of 3000 g, the liquid does not appear to be dispersed, which indicates that the U-type structure inertial switch has the characteristics of anti-high overload.

Path Contribution Analysis of Vibration Transfer Path Systems

To analyze the vibration characteristics of mechanical systems from the aspect of vibration transfer, two types of models for vibration transfer path systems were designed, which comprised three subsystems: excitation sources, transfer paths, and receivers. One type of model represented that the systems only sustained unidirectional force excitation, where the transfer paths remained free from the influence of mass parameters. The other type indicated that the systems were subjected to simultaneous excitations of forces and moments, with transfer paths without mass parameter. Because the transfer characteristics of vibration paths directly determine the output response behaviours of the systems, the analysis of path contributions to the vibration responses of system receivers is important in systemic vibration and noise reduction. In order to evaluate the path contributions quantitatively, the concepts of path transfer ratio (TR) and path insertion loss (IL) were introduced and the convenient formulae were derived based on the path transfer force analysis and the path disconnected method in this work. Thereby the measurement of path contributions to the receiver vibration responses within the frequency domain can be accomplished. Through numerical examples, the ideal calculation results were obtained. These conclusions further indicate that the path TR and path IL can be applied as evaluation indicators of path contributions for the vibration transfer path systems.

World literature, a decentred sphere

Franco Moretti and Pascale Casanova’s accounts of world literature are coded in metaphors. The former employs a core-periphery system to examine the unequal relationships between national literatures; the latter sees world literature as a ‘world literature of letters’, wherein the exchanges between literary traditions take place following economic patterns. This essay discusses to what extent these metaphors are inadequate to analyse the current trends of world literature as they portray the so-called central literatures as unidirectional forces that inform the canon, thereby shaping the literary production. This perspective privileges an economical jargon which constitutes an ideological bias resulting in the homogenisation of the literary value. This article takes a different approach by offering an alternative metaphor to explain world literature and its dynamics. This metaphor is a decentred sphere without a circumference. In order to illustrate this point, William Ospina’s El año del verano que nunca llegó (2015) is analysed, focusing on its worldly elements.

Topological design of compliant orthogonal displacement amplification mechanism under the unidirectional input force

The orthogonal displacement amplification mechanism is used to output and amplify the displacement perpendicular to the direction of the input force, and its configuration often uses a typical bridge-type. However, the bridge-type amplifier to achieve orthogonal shift conversion must enter the bidirectional symmetric input forces, otherwise the output will produce parasitic displacement. In view of this problem, the topology optimization method is used to find the new configuration of the displacement amplification mechanism, so that it can still realize the orthogonal displacement transformation under the unidirectional input force condition. Based on the solid isotropic material with penalization (SIMP) topological description method, the ratio of output and input displacements is maximized as the objective function, the ratio of parasitic displacement and output displacement as one of constraint functions, and the topological optimization mathematical model of the compliant orthogonal displacement amplifier is established under the unidirectional input force. The sensitivity information of the objective and constraint functions is deduced by the adjoint matrix method, and the optimization problem is solved by the method of moving asymptotes (MMA). The topology optimization results of orthogonal displacement amplifier are given through numerical examples, and the effect of spring stiffness on the topology optimization result is also discussed. Finally, the parasitic motions of the displacement amplification mechanism obtained from topology optimization and the bridge-type amplification mechanism are compared through the finite element analysis and experiment. Finite element simulation and experiment confirm the correctness and validity of the proposed method.

MHD-physical modification effect on microstructure control of the 7xxx high-strength Alalloys

In this study, the possibilities of the microstructure refinements effect of processing by electromagnetic and magneto-hydrodynamic means on high-strength casting aluminium alloys Al-Zn-Mg-Cu/Ni (0.2%Zr) system has been studied. In the case of direct manufacturing of high-strength casting Al-alloy by the MHD-physical affecting, the unidirectional 120Hz pulse electromagnetic force(70∼143.5N, 2.5∼3.5m/s) created in working area(WA) of the magneto-dynamic installation electromagnetic pump has provide a fine emulsion distribution of intermetallic particles in liquid melt during intensive MHD-processing for melt capacity of 150∼500kg. Microstructure of permanent chill-mold specimens (1” rod and 3” billet) has shown the unique non-dendrite microstructure with compact grains in range of 50∼100μm, and distributed homogeneity by all cross-section, instead an over 250μm dendrites for the non-treated state at sampling from conventional melting furnace.As well, applying MHD-processed alloy for low pressure casting method at manufacturing 3” billet for 550mm lengths into graphite tube have an mainly compact globular microstructure, characterized as non-dendrite state with 80∼120μm grain size and 50∼80μm in the central part of billet. Achieved effect can be explained by an artificial heat-force effect of the pulse unidirected electromagnetic force, created in the MDI working area which affecting the solidification structure. In addition just 10 minutes for 150kg alloy by artificial pumping mode MHD melt processing was found to increase cast-ability of the Al-Zn-Mg-Cu casting high-strength alloy at pouring temperature of 680∼720°C, wherein hot-cracks disappear, and hot-cracks effect is not occurs for the different conditions of the pouring speed.Tensile stress test of the developed high-strength casting Al-Zn-Mg-Cu alloys has been shown 547∼566MPa, 516∼547 yield stress and 2.9-3.4°% elongation for the case of chill mold gravity casting.

Controlling Interlayer Spacing of Graphene Oxide Membranes by External Pressure Regulation.

Graphene oxide (GO) membranes have been attracting numerous attention due to their impressive performance in various applications, especially in water purification. However, because the swelling in water and polar organic solvents causes the increase of interlayer channels, GO membranes usually possess inferior rejection for subnanometer-sized molecules. How to control the transport channels of GO membranes at angstrom level is a significantly scientific and practical issue. Herein, a concept of external pressure regulation (EPR) is reported for restraining GO swelling and controlling its interlayer spacing precisely. Since anisotropic GO films only swell at vertical direction, the interlayer channels can be manipulated by externally unidirectional reverse force. Based on this concept, an EPR system with GO membranes is designed for water desalination by adjusting the external pressure that has high resolution. In cross-flow filtration, the compressed GO membranes show high KCl, NaCl, and CaCl2 rejections of 94%, 97%, and 98%, respectively, accompanied by large water permeance up to 25 L m-2 h-1 under low feed pressure of 2 bar, despite the fact that the semi-free spatial swelling of ultrathin GO layer above the substrate pores can deteriorate salt rejection. Our work provides a straightforward physical strategy to adjust the interlayer spacing of the membranes fabricated by two-dimensional nanosheets for achieving desired filtration capacity.

Acoustic radiation force manipulation of tissue, cell, and interactions with neurons

It is well known that an object in a sound field that absorbs, scatters, or reflects sound energy is subjected to the acoustic radiation force, and thus can be manipulated without contact. This unidirectional force has profound application in biomedicine. For example, the acoustic radiation force can be used to generate localized displacements in tissue, and the magnitude of the tissue displacement is inversely proportional to the local stiffness of the tissue. Based on this principle, the acoustic radiation force interaction with the tissue can be used for elasticity Imaging. The acoustic radiation force can also be used to manipulate cell’s movement and simulate isolated neuron, which may have potential application in tissue engineering and ultrasound neuro-modulation. In this study, our recent research on the application of the acoustic radiation force for manipulation of tissue, cell and interactions with neurons, will be presented. New approaches or systems for generation acoustic radiation force with special application will also be shown.

Application of Bone Fractography to a Medical Examiner Sample: A Case Series

This case study review assesses the applicability of forensic fractography of bone to forensic casework through the evaluation of four blunt-trauma cases. The objectives were to determine (1) whether fractographic features are readily identifiable in real-world trauma scenarios and (2) whether the fractographic analysis corresponds to traditional anthropological fracture pattern analysis. Fractography is the study of fracture surface features and their relationship to crack propagation. Recently, the diagnostic value and expression variation of fractographic features in bone were evaluated and found to be informative on samples derived from controlled, experimentally induced fractures created under unidirectional force (Christensen et al. 2018). Fractures occurring during life events and examined in forensic contexts may be more complex than experimentally induced fractures. For this case study series, fractography is applied to specimens from four cases previously received for anthropology consultation in a medical examiner setting. For fractures located in areas of thick cortical bone, interpretation of fractographic features was consistent with the previous anthropological and autopsy soft-tissue findings. However, in one case where fractures were located in areas of thin cortical bone, fewer surface features were observed and the fractography analysis was inconclusive. The results of this case series show that fractography is applicable to fractures that occur under complex scenarios, and also confirms previous suggestions that it may have greater utility for bones with greater fracture surface area.

A novel method to measure skin mechanical properties with three-dimensional digital image correlation.

Measuring skin mechanical properties has been of great interest in the skincare industry. It is a high accuracy and non-invasive optical technique which quantitatively tracks skin movement and deformation under mechanical perturbations. A study was conducted with female subjects (25-65years old). A refined speckle pattern applied onto the skin surface was used for DIC measurements. A unidirectional force pulled the skin at a constant velocity, while the deformation process was quantified by the DIC. Prior to the DIC measurement, Cutometer® readings were taken on the same area. The DIC protocol's reproducibility across multiple pattern applications, the measurement's repeatability, and the sensitivity in differentiating skin mechanical properties were investigated. Subjects were clustered with statistical significance according to their skin mechanical properties described by six DIC metrics (μ [major strain], σ [major strain], μ [minor strain], σ [minor strain], μ [displacement], and σ [displacement]). Most measurement random errors are below 6%. This is several folds smaller in magnitude than the difference in the mean response between the clusters. Several Cutometer® parameters also showed good agreement with μ (displacement). DIC was able to differentiate skins of different mechanical qualities. We also proposed the physical significance of the DIC metrics. Some of the DIC metrics potentially offer new insights into skin mechanical properties that complement those revealed by conventional instruments. Accurate measurements, large measurement areas along with ease of direct visualization are substantial advantages of DIC.

Human's Capability to Discriminate Spatial Forces at the Big Toe.

A key factor for reliable object manipulation is the tactile information provided by the skin of our hands. As this sensory information is so essential in our daily life it should also be provided during teleoperation of robotic devices or in the control of myoelectric prostheses. It is well-known that feeding back the tactile information to the user can lead to a more natural and intuitive control of robotic devices. However, in some applications it is difficult to use the hands as natural feedback channels since they may already be overloaded with other tasks or, e.g., in case of hand prostheses not accessible at all. Many alternatives for tactile feedback to the human hand have already been investigated. In particular, one approach shows that humans can integrate uni-directional (normal) force feedback at the toe into their sensorimotor-control loop. Extending this work, we investigate the human's capability to discriminate spatial forces at the bare front side of their toe. A state-of-the-art haptic feedback device was used to apply forces with three different amplitudes—2 N, 5 N, and 8 N—to subjects' right big toes. During the experiments, different force stimuli were presented, i.e., direction of the applied force was changed, such that tangential components occured. In total the four directions up (distal), down (proximal), left (medial), and right (lateral) were tested. The proportion of the tangential force was varied corresponding to a directional change of 5° to 25° with respect to the normal force. Given these force stimuli, the subjects' task was to identify the direction of the force change. We found the amplitude of the force as well as the proportion of tangential forces to have a significant influence on the success rate. Furthermore, the direction right showed a significantly different successrate from all other directions. The stimuli with a force amplitude of 8 N achieved success rates over 89% in all directions. The results of the user study provide evidence that the subjects were able to discriminate spatial forces at their toe within defined force amplitudes and tangential proportion.

Anisotropic, Mesoporous Microfluidic Frameworks with Scalable, Aligned Cellulose Nanofibers.

Cellulose paper has been extensively used in microfluidic analytical devices because of its hydrophilic nature. However, cellulose is randomly packed in paper without any particular orientation or channels within the bulk of the material, necessitating a complicated design of hydrophilic microchannels to guide the liquid flow. Herein, we develop an anisotropic mesoporous microfluidic framework (named as white wood) with aligned cellulose nanofibers and inherent microchannels via a facile one-step delignification process from natural wood. The hydrophilic nature of the innate microchannels in white wood makes it ideal for application as a pump-free microfluidic chip, exhibiting a fast and anisotropic liquid and large solid particle (as demonstrated with carbon nanotubes) mass transport, with a high transport speed along the channel direction approximately five times faster than that perpendicular to the channel direction. The anisotropic mass transport is further exemplified in the fabrication of chitosan films with aligned microstructures and birefringence, formed by virtue of unidirectional capillary forces exerted by the microchannels. We envision that our anisotropic mesoporous framework can have great applications to pump-free microfluidics, and the simple preparation process will pave a new way for the development of microfluidic devices based on chemically modified wood.