Pure Evaporation Research Articles

Significantly enhanced sub-ambient passive cooling enabled by evaporation, radiation, and insulation

Passive cooling relying on evaporation and radiation, while offering great energy-saving opportunities, faces challenges with low ambient cooling powers, environmental heating, high water usage, and climate condition constraints. To overcome these shortcomings, here, we present insulated cooling with evaporation and radiation (ICER), which utilizes a solar-reflecting layer; an infrared-emitting evaporative layer; and an infrared-transparent, solar-reflecting, and vapor-permeable insulation layer. One major advantage of ICER is that it synergistically combines thermal insulation, evaporative cooling, and radiative cooling. Consequently, it consistently achieves below-wet-bulb temperatures with much less water consumption than pure evaporation while reaching 9.3°C below the ambient temperature under direct sunlight. With unfavorable climate conditions, ICER delivers 96 W/m2 daytime cooling power at the ambient temperature and shows a 300% enhancement over the state-of-the-art radiative cooler. During the summer months, without electricity, ICER can extend food shelf life by 40% in humid climates and 200% in dry climates with low water-refilling frequencies.

Shape‐Controlled Solution‐Epitaxial Perovskite Micro‐Crystal Lasers Rivaling Vapor Deposited Ones

AbstractEpitaxial growth methods usually need dedicated equipment, high energy consumption to maintain pure vacuum conditions and evaporation of source materials, and elevated substrate temperatures. Solution epitaxial growth requires nothing of that but is rarely used because the achieved microstructures are of low quality, not homogeneous, and finally exhibit worse performances in devices. Here, an antisolvent‐vapor‐assisted‐crystallization of metal‐halide‐perovskites as a method overcoming these disadvantages is demonstrated. The methylammonium lead tribromide exhibits van‐der‐Waals type of epitaxial growth on mica substrates, resulting in micro‐crystallites whose shape can be controlled to be either triangular micro‐prism or micro‐cuboid. These micro‐crystallites act as optical resonators supporting various optical modes and lasing is achieved under optical excitation with low thresholds and record high environmental stability. Selecting suitable resonators from a large variety of sizes allows control of mode spacing and finally mono‐mode operation, considered to be an important feature of semiconductor laser devices. The achieved results are essentially competitive to those obtained by vapor phase epitaxial microstructures, highlighting that epitaxy of high‐quality optoelectronic device structures is feasible by minimum technological efforts and energy consumption, which are of increasing importance considering issues such as global warming and the current energy crisis.

Efficient water purification and desalination using hydrogel and aerogel solar evaporators based on different carbon materials

Interfacial solar evaporation, which utilizes abundant and clean solar energy for wastewater desalination purification, is emerging as an environmental-friendly and energy-efficient technology for producing clean water. In this paper, sodium alginate (SA) gel evaporators based on different carbon materials were proposed. A simple and convenient evaporator was constructed by comparing the network properties of hydrogels and aerogels, as well as the photothermal conversion efficiencies of CNTs and graphene. CNTs-SA-hydrogel (CSH) had higher evaporation rate and better water purification than CNTs-SA-aerogel (CSA), with the evaporation rate of 1.60 kg m-2h−1 and ion removal rate of 99 %.However, the evaporation performance and desalination efficiency of graphene-SA-aerogel (GSA) were better than those of graphene-SA-hydrogel (GSH). In particular, GSA gave the bestperformancewith a pure water evaporation rate of 1.73 kg m-2h−1. Even in a 20 wt% high-salt wastewater, it could generate steam consistently with an evaporation rate of 1.56 kg m-2h−1 without any significant performance degradation. In addition, it also had outstanding desalination ability and could completely decolorize in organic dyes. Therefore, this study provides a new idea to further promote the rapid development and application of interfacial solar steam generation in desalination and purification of seawater.

Alkali treatment combined with surface carbonized wood for high-efficiency solar interfacial evaporation

With the shortage of fresh water, one of the most promising strategies to solve this problem is solar interfacial evaporation. Due to the porous structure, low heat conduction, high hydrophilicity and renewability, we develop a wood-based solar generator by a facile method of alkali treatment and surface carbonization (ASC-wood). Surface carbonization could endow wood generators with a high sunlight absorbency and alkali treatment could improve the water delivery capacity. For further reduce heat conduction loss, an insulation-layer system was proposed in this work. Benefiting from these advantages, the ASC-wood generator can reach an evaporation rate of 1.21 kg m−2 h−1 and an evaporation efficiency of 81.3% under 1 sun irradiation. In addition, the ASC-wood generator shows an outstanding cycling performance and structural stability, which is favorable for outdoor applications. This work provides a simple method to manufacture a scalable, cost-effective, high-efficiency and high-strength solar steam generator. Also, the effect of water temperature on solar evaporation performance was studied, and results show that the pure evaporation efficiency will first increase and then decrease with the increase of water temperature from 20 ℃ to 40 ℃, indicating a way for improving the evaporation efficiency by matching the sensible heat as well as the latent heat.

LGB-PHY: An Evaporation Duct Height Prediction Model Based on Physically Constrained LightGBM Algorithm

The evaporation duct is a special atmospheric stratification that significantly influences the propagation path of electromagnetic waves at sea, and hence, it is crucial for the stability of the radio communication systems. Affected by physical parameters that are not universal, traditional evaporation duct theoretical models often have limited accuracy and poor generalization ability, e.g., the remote sensing method is limited by the inversion algorithm. The accuracy, generalization ability and scientific interpretability of the existing pure data-driven evaporation duct height prediction models still need to be improved. To address these issues, in this paper, we use the voyage observation data and propose the physically constrained LightGBM evaporation duct height prediction model (LGB-PHY). The proposed model integrates the Babin–Young–Carton (BYC) physical model into a custom loss function. Compared with the eXtreme Gradient Boosting (XGB) model, the LGB-PHY based on a 5-day voyage data set of the South China Sea provides significant improvement where the RMSE index is reduced by 68%, while the SCC index is improved by 6.5%. We further carried out a cross-comparison experiment of regional generalization and show that in the sea area with high latitude and strong adaptability of the BYC model, the LGB-PHY model has a stronger regional generalization performance than that of the XGB model.

Numerical investigation of multi-component droplet evaporation and autoignition for aero-engine applications

The droplet evaporation and autoignition behaviour of a three-component kerosene surrogate is numerically investigated for a wide range of ambient pressures and temperatures representing realistic aero-engine conditions. Vitiated air with different levels of dilution is considered to represent mixing of air with combustion products. Particular attention is given to the analysis of multi-component fuel effects at the various operating conditions. The investigation also considers the impact of fuel preheating and multiple initial droplet diameters, and extends to the quantification of NOx emissions at the droplet scale level. Considering pure evaporation, results show that preferential evaporation and variation of the droplet composition are mainly affected by the gas temperature. An increase of the pressure generally increases the duration of the droplet heat-up period and reduces the effects of preferential evaporation, especially when high temperatures are considered. Autoignition in vitiated air is strongly influenced by both the level of dilution and ambient pressure, with the latter playing an important role in determining the value of the initial droplet diameter below which no autoignition occurs. Lower pressures generally make the kerosene droplet more resistant to autoignition for the same level of dilution or gas temperature. Droplet preheating mainly affects the heat-up period and can be used as a design parameter to control the autoignition delay time. NOx levels are substantially related to the gas-phase temperature and the existence of a flame at the droplet scale. Potential implications for the design of future low-emission combustor technologies are discussed with an emphasis on the fuel preparation.

Experiments to understand bubble base evaporation mechanisms and heat transfer on nano-coated surfaces of varying wettability under nucleate pool boiling regime

Absolute surface wettability effects on the characteristics of nucleate pool boiling heat transfer under saturated conditions are investigated with water as working fluid. Wettability of the base surface (ITO-coated sapphire) is modified by coating 60 nm thick SiO2 film using different thin film deposition techniques. In this way, two surfaces with modified wettability (30 o and 65 o static contact angles) have the same surface chemistry with negligible variation in surface roughness, while the base surface itself acts as the third surface with 90 o static contact angle. Experiments are conducted for various constant heat flux conditions. Bubble dynamics and temperature distributions of the substrate surface are mapped in-situ using high speed videography and IR thermography, respectively. Pool boiling curves and overall heat transfer coefficient curves, obtained from the recorded IR images, showed that the overall boiling performance increases with enhanced surface wettability. The observed enhancement has been explained on the basis of the modified bubble dynamics and the associated bubble base evaporation mechanism. The bubble dynamics parameters such as bubble departure diameter and departure frequency, and nucleation site density (NSD) were found to get altered so as to augment the total evaporative heat flux with increasing surface wettability. The heat transfer coefficients and heat transfer rates corresponding to bubble base evaporation for isolated vapor bubble revealed that higher wettability surfaces outperform the surfaces with lower wettability in heat transport through bubble base evaporation. The corresponding underlying mechanisms have been identified. In addition, it was found that the microlayer evaporation mechanism is more efficient as compared to that based on pure contact line evaporation in transporting the heat away from the surface.

A robust PVA/C/sponge composite hydrogel with improved photothermal interfacial evaporation rate inspired by the chimney effect

Solar-driven interfacial evaporation has attracted significant research attention owing to its high conversion efficiency of solar energy and transformative industrial potential. The evaporation rate depends on the intrinsic properties of the photothermal conversion materials and external environmental factors. The development of a photothermal evaporation device with a high evaporation rate is urgently required for the application of photothermal interfacial evaporation. Here, we introduce a chimney in a hydrogel composite material to create a novel photothermal evaporation device. First, we fabricated a hydrogel composite material by in situ polymerization in the sponge. The porous structure of the sponge endows the resulting composite hydrogel with a high water-absorption rate. Thus, it improves the water supply rate of traditional hydrogel materials. Meanwhile, we applied a 26 cm high chimney to the photothermal evaporation device and demonstrated that the evaporation rate highly increased from 1.56 to 5.90 kg m−2 h−1 for pure water evaporation, 1.43 to 4.47 kg m−2 h−1 for seawater evaporation under 1 sun illumination. The evaporation system requires no additional energy input or other external conditions. In addition, the improved device structure is simple and can be applied to previously reported photothermal evaporation systems to achieve a higher evaporation rate.

Flow and heat measurement within self-rewetting mixtures of 1-pentanol and water drops

Recently interest has arisen in the use of so-called self-rewetting mixtures for micro-scale heat transfer systems. Such fluids, in which the surface tension can increase with increasing temperature, are expected to offer superior evaporative cooling performance by extending the region of operation before dry-out of the heated surface sets in. Whilst improved performance has been shown in some practical situations using these fluids, it is not entirely clear as to the mechanism of such improvements. We have studied the flow within evaporating sessile drops of 1-pentanol-water mixtures using micro-PIV and have observed three stages in the evaporation process. During the first stage there appears to be a single toroidal vortex with flow inwards along the base of the drop. The vortex only occupies the central region of the drop and appears to pulsate, reducing in size during evaporation. This is followed by a second transition stage to a third stage in which the flow is directed radially outward, as observed by us for pure water droplet evaporation and in the latter stages of ethanol-water drop evaporation.

Molecular dynamics simulations on evaporation of a suspended binary mixture nanodroplet

Mixture working fluids have the advantages of active design and adjustable physical properties, therefore it has a promising future in many power and refrigeration applications. Studies on the evaporation process of mixture nanodroplets are helpful to reveal the mechanism of heat transfer at the interface of mixture working fluids. However, at present, there are few studies on the evaporation of mixture droplet, and the conclusions on the pure fluids evaporation cannot be directly applied to the mixture working fluids, thus it is necessary to carry out specific research on the evaporation of mixtures. In this study, molecular dynamics simulation was used to study the evaporation process of R32/R1234yf nanodroplets with different compositions (xR32=0, 0.2, 0.4, 0.6, 0.8, 1) in a large space. The dynamic changes of evaporation rates of droplets with different components were compared, and the evaporation characteristics of droplet with different concentrations were analyzed in combination with the density, temperature and concentration field distribution near the liquid-vapor interface during the evaporation process. The results show that the evaporation rate of the mixture nanodroplets is lower than the linear interpolation with those of the two components, which is similar to the heat transfer deterioration of the mixture working fluids in pool or flow boiling. The prediction deviation of R32/R1234yf mixture nanodroplet evaporation by the D2 law is around 80%. Considering the scale effect and the interfacial concentration gradient, the prediction accuracy of the D2 law can be improved.

Thermodynamic patterns during in-situ heating of InAs nanowires encapsulated in Al2O3 shells

Understanding the dynamic thermal behavior of nanomaterials based on their unique physical and chemical properties is critical for their applications. In this study, the thermal behavior of single-crystalline InAs nanowires in an amorphous Al2O3 shell was investigated by conducting in situ heating experiments in a transmission electron microscope. Two different thermodynamic patterns were observed during the in situ heating experiments: (1) continuous vaporization and condensation simultaneously at temperatures lower than 838.15 K, and (2) pure evaporation at temperatures higher than 878.15 K. During the simultaneous condensation and vaporization in closer areas in a single InAs nanowire, the front edge of the vaporization was flat, while that of the condensation actively changed with time and temperature. Pure vaporization was conducted via layer-by-layer evaporation followed by three-dimensional vaporization at the final stage. The thermal behaviors of the InAs nanowires were demonstrated from a thermodynamic point of view.

Comparison of spray evaporation characteristics of five-hole GDI injectors with different hole arrangements under flash boiling conditions

Spray evaporation characteristics have an important influence on air-fuel mixing and the optimization of combustion to achieve high performances and ultra-low emissions. This study aims to compare and analyze the evaporation characteristics of five-hole gasoline direct injection injectors with different hole arrangements under flash-boiling conditions. The holes of two injectors are arranged as a pentagon. The hole arrangement of injector A (standard type) is similar to a regular pentagon, whereas two holes on the sides of the pentagon corresponding to injector B (skew type) are shifted toward the inside and bottom of the pentagon. In this study, Schlieren and Mie-scattering techniques are used to visualize the evaporation of spray. Although this method is difficult to extract the vapor area from the vapor-liquid mixing zone, it can accurately calculate the area of the pure evaporation zone by subtracting the area of the liquid phase mixing zone from the global area. Therefore, this study compared the spray evaporation characteristics of the two injectors relatively, by calculating the area of the pure evaporation zone. Experiments were compared with different injector directions (0° and 90°) and under a wide range of superheat conditions (0°C–130 °C). Only a slight difference is found between the evaporation characteristics of the standard- and skew-type injectors in the 0° direction. However, in the 90 direction, before the spray collapses, the larger plume spacing of the skew-type injector, determined by the injector hole arrangement, promotes air-flow in the spray center, leading to larger evaporation ratio. After the spray collapses, the spray structure difference caused by the hole arrangement is reduced, and the two injectors exhibit similar evaporation characteristics.

Composition dependence of cyclohexane‐extracted gangue drying at ambient conditions

AbstractThe drying of residue cyclohexane in a series of reconstituted gangue samples at ambient conditions was studied. The reconstituted gangue samples contained controlled amounts of residual bitumen, water, and fines (solid particles <45 μm). Regardless of the gangue composition, the initial drying flux was constant, and more than 90% of the residual cyclohexane was removed in this stage. The initial drying was driven by the liquid film flow induced by the differences in liquid film's radii of curvature along the pore channels. The liquid was a diluted bitumen solution that was transported to the surface, where cyclohexane evaporated with a rate comparable to that of pure cyclohexane evaporation. Upon the solvent evaporation, the dissolved bitumen was deposited on the sample surface. The residual bitumen content exerted an adverse effect on the initial drying flux because the dissolved bitumen significantly increased the solution viscosity, thereby reducing the liquid film flow rate. There existed an optimum water content range (3.9‐6.0 wt%) that facilitated the formation of bitumen solution film in the pores, favouring drying. When there was a high concentration of water or no water, the initial drying flux was decreased remarkably. The initial drying flux was insensitive to the fines content. Adding fines may have two counteracting effects on the drying process. Fines decreased the mean pore size, thereby lowering the liquid film flow rate. However, the hydrophobicity of the pore surfaces was increased as fines are usually covered by asphaltenes. This favours liquid film formation.

Stable and Efficient Nanofilm Pure Evaporation on Nanopillar Surfaces.

Molecular dynamics simulations were conducted to systematically investigate how to maintain and enhance nanofilm pure evaporation on nanopillar surfaces. First, the dynamics of the evaporation meniscus and the onset and evolution of nanobubbles on nanopillar surfaces were characterized. The meniscus can be pinned at the top surface of the nanopillars during evaporation for perfectly wetting fluid. The curvature of the meniscus close to nanopillars varies dramatically. Nanobubbles do not originate from the solid surface, where there is an ultrathin nonevaporation film due to strong solid-fluid interaction, but originate and evolve from the corner of nanopillars, where there is a quick increase in potential energy of the fluid. Second, according to a parametric study, the smaller pitch between nanopillars (P) and larger diameter of nanopillars (D) are found to enhance evaporation but also raise the possibility of boiling, whereas the smaller height of nanopillars (H) is found to enhance evaporation and suppress boiling. Finally, it is revealed that the nanofilm thickness should be maintained beyond a threshold, which is 20 Å in this work, to avoid the suppression effect of disjoining pressure on evaporation. Moreover, it is revealed that whether the evaporative heat transfer is enhanced on the nanopillar surface compared with the smooth surface is also affected by the nanofilm thickness. The value of nanofilm thickness should be determined by the competition between the suppression effect on evaporation due to the decrease in the volume of supplied fluid and the existence of capillary pressure and the enhancement effect on evaporation due to the increase in the heating area. Our work serves as the guidelines to achieve stable and efficient nanofilm pure evaporative heat transfer on nanopillar surfaces.

Digital holographic interferometry investigation of liquid hydrocarbon vapor cloud above a circular well.

The current study investigates evaporation of liquid hydrocarbons from a circular well cavity of small depth. Gravimetric analysis is performed to measure the evaporation rate and digital holographic interferometry is used for the measurement of normalized mole fraction profile inside the vapor cloud above the well. Phase unwrapping has been implemented to obtain continuous phase distribution in the image plane. The Fourier-Hankel tomographic inversion algorithm is implemented to obtain the refractive index change distribution inside the object plane, i.e., vapor cloud. Four liquid hydrocarbons, i.e., pentane, hexane, cyclohexane, and heptane, are studied. The radius of circular well cavities is varied in the range of 1.5 to 12.5 mm. Results using a quasi-steady, diffusion-controlled model are compared with the experimental evaporation rate. Measured evaporation rates are higher than the diffusion-limited model calculation for all working fluids and well sizes. This difference is attributed to natural convection occurring inside the vapor cloud due to the density difference between the gas-vapor mixture and the surrounding air. Holographic analysis confirms the presence of natural convection by revealing the formation of a flat disk-shaped vapor cloud above the well surface. Experimentally obtained vapor cloud shape is different from the hemispherical vapor cloud obtained using the pure diffusion-limited evaporation model. The gradient of vapor mole fraction at the liquid-vapor interface is higher compared to that of the diffusion-limited model because of the additional transport mechanism due to natural convection. Transient analysis of the vapor cloud reveals time invariant overall shape of the vapor cloud with a reduction in average magnitude of vapor concentration inside the vapor cloud during evaporation. The existing correlation for sessile droplet cannot successfully predict the evaporation rate from a liquid well. A new correlation is proposed for evaporation rate prediction, which can predict the evaporation rate within a root mean square error of 5.6% for a broad size range of well cavity.

Numerical simulation of liquid hydrogen droplets “group” evaporation and combustion

The leakage of LH from high-pressure storage tanks will trigger a series of behaviors such as group evaporation, dispersion, and combustion. In this study, hydrodynamic model combined with point source method (PSM) were tested for the analysis of “group interaction effects” involved in LH droplets evaporation and combustion processes. Three specific arrangement array cases: binary, equilateral triangular, and five-particle array were selected. With regard to binary array, in the case of pure evaporation (T∞=300K), surface H2 mass fraction (YH2,w) is equal to 0.77 on the side near the other droplet and 0.75 on the side away from the other droplet. When combustion occurs (T∞=3000K), it takes 0.0752 s for binary droplets to finish evaporation. The flame front is located at 156 times the LH droplet radius (156 a0) away from the binary array midpoint and its temperature (Tf) can go up to 3885 K. The flame of the binary LH array changes from a common flame to two individual flames when the distance of the two droplets (l0) is equal to 364 times the droplet radius (l0=364a0). And when l0/a0 is set to 1500, interactions between the two droplets disappears completely. In the cases of equilateral triangular array and five-particle array combustion (T∞=300K), larger flames are formed due to local deficiency of oxygen. The flame front is located at 230 a0 away from the equilateral triangular array midpoint and 365 a0 away from the five-particle array midpoint, respectively.

High Heat Flux Evaporation of Low Surface Tension Liquids from Nanoporous Membranes.

Water is often considered as the highest performance working fluid for liquid-vapor phase change due to its high thermal conductivity and large enthalpy of vaporization. However, a wide range of industrial systems require using low surface tension liquids where heat transfer enhancement has proved challenging for boiling and evaporation. Here, we enable a new paradigm of phase change heat transfer, which favors high volatility, low surface tension liquids rather than water. We utilized a nanoporous membrane of ≈600 nm thickness and <140 nm pore diameters supported on efficient liquid supply architectures, decoupling capillary pumping from viscous loss. Proof-of-concept devices were microfabricated and tested in a custom-built environmental chamber. We used R245fa, pentane, methanol, isopropyl alcohol, and water as working fluids with devices of total membrane area varying from 0.017 to 0.424 cm2. We realized a device-level pure evaporation heat flux of 144 ± 6 W/cm2 for water, and the highest evaporation heat flux was obtained with pentane at 550 ± 90 W/cm2. We developed a three-level model to understand vapor dynamics near the interface and thermal conduction within the device, which showed good agreement with experiments. We then compared pore-level heat transfer of different fluids, where R245fa showed approximately 10 times the performance of water under the same working conditions. Finally, we illustrate the usefulness of a figure of merit extracted from the kinetic theory for evaporation. The current work provides fundamental insights into the evaporation of low surface tension liquids, which can impact various applications such as refrigeration and air conditioning, petroleum and solvent distillation, and on-chip electronics cooling.

Enhanced solar evaporation efficiency based on the inserted preheating zone of silver nanowires

In this paper, a new type of floating solar evaporator with a three-layer composite structure has been successfully fabricated, with the carbon nanotube (CNT) as the photothermal layer, the silver nanowires as the preheating layer and the glass fibers as the insulation layer. The solar evaporator exhibited excellent solar absorption and photothermal conversion properties, and the surface temperature of the dried evaporator could reach 106 °C under one solar irradiation intensity. Importantly, the pure water evaporation rate and the solar evaporation efficiency of this evaporator were 1.70 kg/m2 h and 95%, respectively. Based on the multi-layer composite structure of the evaporator, the addition of the silver nanowires as the preheating layer effectively reduced the loss of the thermal energy of the photothermal layer as the heat source and the evaporation region. The purpose of this study is to improve the solar energy efficiency by reducing heat conduction losses through the design of evaporators.

Evaporation of liquid nitrogen droplets in superheated immiscible liquids

Liquid nitrogen or other cryogenic liquids have the potential to replace or augment current energy sources in cooling and power applications. This can be done by the rapid evaporation and expansion processes that occur when liquid nitrogen is injected into hotter fluids in mechanical expander systems. In this study, the evaporation process of single liquid nitrogen droplets when submerged into n-propanol, methanol, n-hexane, and n-pentane maintained at 294 K has been investigated experimentally and numerically. The evaporation process is quantified by tracking the growth rate of the resulting nitrogen vapour bubble that has an interface with the bulk liquid. The experimental data suggest that the bubble volume growth is proportional to the time and the bubble growth rate is mainly determined by the initial droplet size. A comparison between the four different bulk liquids indicates that the evaporation rate in n-pentane is the highest, possibly due to its low surface tension. A scaling law based on the pure diffusion-controlled evaporation of droplet in open air environment has been successfully implemented to scale the experimental data. The deviation between the scaling law predictions and the experimental data for 2-propanol, methanol and n-hexane vary between 4 and 30% and the deviation for n-pentane was between 24 and 65%. The more detailed bubble growth rates have been modelled by a heuristic one-dimensional, spherically symmetric quasi-steady-state confined model, which can predict the growth trend well but consistently underestimate the growth rate. A fixed effective thermal conductivity is then introduced to account for the complex dynamics of the droplet inside the bubble and the subsequent convective processes in the surrounding vapour, which leads to a satisfactory quantitative prediction of the growth rate.

Field-Effect Transistors Based on 2D Organic Semiconductors Developed by a Hybrid Deposition Method.

Solution‐processed 2D organic semiconductors (OSCs) have drawn considerable attention because of their novel applications from flexible optoelectronics to biosensors. However, obtaining well‐oriented sheets of 2D organic materials with low defect density still poses a challenge. Here, a highly crystallized 2,9‐didecyldinaphtho[2,3‐b:2′,3′‐f]thieno[3,2‐b]thiophene (C10‐DNTT) monolayer crystal with large‐area uniformity is obtained by an ultraslow shearing (USS) method and its growth pattern shows a kinetic Wulff's construction supported by theoretical calculations of surface energies. The resulting seamless and highly crystalline monolayers are then used as templates for thermally depositing another C10‐DNTT ultrathin top‐up film. The organic thin films deposited by this hybrid approach show an interesting coherence structure with a copied molecular orientation of the templating crystal. The organic field‐effect transistors developed by these hybrid C10‐DNTT films exhibit improved carrier mobility of 14.7 cm2 V−1 s−1 as compared with 7.3 cm2 V−1 s−1 achieved by pure thermal evaporation (100% improvement) and 2.8 cm2 V−1 s−1 achieved by solution sheared monolayer C10‐DNTT. This work establishes a simple yet effective approach for fabricating high‐performance and low‐cost electronics on a large scale.