Effect Of Change In Angle Research Articles

A new design mobile cabin hospital based on the Hoberman sphere

Mobile cabin hospitals have been established in many countries and regions to cope with the spread of the new crown epidemic. The feasibility and convenience of the model are analyzed in the context of practical situations. This paper examines and exploits the collapsibility and convenience of Hoberman spheres, their principles and methods of movement, and the dynamics of the scissor structure, which is the basic unit of movement of Hoberman spheres. The effect of changes in angle as well as the length of the scissor-like structure leading to the size of the sphere is analyzed. It was also studied and analyzed through specific model designs, what materials are more suitable for the lining material. The resulting design for the individual wards of the mobile cabin hospital was constructed from half of the Hoberman spherical shell and covered with protective material inside. The final optimization of the combination makes it innovative. The design objectives were simple, easy to install and transport, and reusable.

Employing the Defective Photonic Crystal Composed of Nanocomposite Superconducting Material in Detection of Cancerous Brain Tumors Biosensor: Computational Study

The present research is focused on the externally tunable defect mode properties of a one dimensional (1D) defective photonic crystal (DPhC) for fast detection of cancerous brain tumors. The proposed design has utilized conventional 1D DPhC whose cavity is coated with SiO2 nanoparticles embedded in a superconducting material layer called a nanocomposite layer. The purpose of a nanocomposite superconducting layer is to induce temperature dependent external tuning of the defect mode inside PBG, in addition, to changing in the angle of incidence. The inclusion of a nanocomposite layer also improves the interaction between light and different brain tissue samples under examination. In order to investigate the transmission properties of the proposed structure the transfer matrix formulation in addition to the MATLAB computational tool has been used. First, we have chosen the optimized internal parameters at normal incidence to obtain the maximum performance of the design. Secondly, the effect of change in angle of incidence has been studied to further increase the performance by means of sensitivity, quality factor, the figure of merit and limit of detection to ensure external tuning of defect mode. After achieving a maximum value of sensitivity (4139.24 nm/RIU) corresponding to a sample containing a wall of brain tissues at θ = 63° we have further investigated the effect of change in temperature of nanocomposite layers on the position and intensity both of the defect mode inside PBG. We have found that the increase in temperature results in minute changes in sensitivity but a significant increase in the intensity of defect mode which is highly required in any photonic biosensing design. The findings of this study may be very useful for designing various bio-sensing structures which could have a significant and decisive role in the field of biomedical applications.

Study of Bridge Rectangular Fin Heat Sink and the Effect of Angle Change on CPU Cooling

Study of Bridge Rectangular Fin Heat Sink and the Effect of Angle Change on CPU Cooling

Effect of novel flow divider type turbulators on fluid flow and heat transfer

This research article reports the results of experimental and numerical findings on friction coefficient and forced convection heat transfer characteristics for air flow inside a heated tube incorporated by novel flow divider type turbulators. The simulation tests were conducted for turbulent flow regime within the Reynolds number range of 7000–21000. The parameters investigated were the pitch to tube diameter ratio (p/d = 0.54, 0.72 and 1.09), with angle of twist (θ) 90°. The introduction of this novel turbulators induce an extra turbulence near tube wall and thus efficiently disrupt a thermal boundary layer. The experimental as well as numerical simulation test reveals that the heat transfer rate, friction factor and thermal enhancement factor increased with decreasing pitch to diameter ratio (p/d) of novel flow divider type turbulators. The mechanism behind the heat transfer enhancement is observed to be displacement of the fluid from central core region towards the walls of tube by novel flow divider type turbulator. As well as CFD simulations were conducted to find the effect of change in angle of twist of the turbulator, which shows that Nusselt number enhances by 1.33–1.46 times, and 1.43–1.60 times respectively for 45° and 30°.

Sensitivity Analysis of Buried Jointed Pipelines Subjected to Earthquake Waves

In this study, a number of nonlinear time-history dynamic analyses are conducted on a part of Tehran water distribution network to investigate its functionality during transient large ground motions. The network is of 950-meter length, consisting of ductile iron pipes segments of 6-meter length. Pipes are modeled using beam elements and springs characterize the connections. Considering the time lag between support inputs, and the nonlinear soil-pipe interaction, by scaling the amplitude of the Tab as earthquake record, incremental dynamic analysis is carried out on the network in two orthogonal directions and the sensitivity of the network response is examined. Furthermore, the effects of variations in soil damping and soil spring stiffness are also studied in the network analysis. Finally the effect of changes in angle between incoming wave and pipeline is considered on a simplified network. Results show that the points other than critical ones at network intersections remain almost intact and when the angle of incidence is 30 degrees the stress and rotation peak.

Development of mixing time correlation for a double jet mixer

AbstractBACKGROUND: Jet mixing is one of the simplest methods to achieve mixing. There have been a number of experimental studies concerned with jet mixing; some of these studies report empirical correlations. The existing correlations are not useful where there are significant deviations from the idealized conditions. Most correlations reported in the literature deal with liquid flow with single or multiple jets, whereas the effect of radial angle on mixing time was not studied. This present study investigates the effect of operating parameters on experimental mixing time in a double jet mixer. Nozzle configuration for jet1 was fixed based on earlier studies (2/3rd position, nozzle angle 45° and nozzle diameter 10 mm). Mixing times were estimated for different jet2 configurations of jet angle (30°, 45° and 60°), radial angles (60°, 120°, 180°), jet diameter (5 mm and 3 mm) and located at different tank heights (2/3rd and 1/3rd from the bottom of the tank).RESULTS: A mixing time correlation was developed in terms of all the parameters using dimensional analysis. The constants and powers of the parameters involved in the correlation developed were estimated using a least square method to calculate the straight line that best fitted the mixing time data obtained during the experiments. The effects of change in angle of inclination of jet2 (θ2), radial angle of jet2 with respect to jet1 (Φ2) and diameter of jet2 (d2) on mixing time were analyzed and compared with the experimental mixing time.CONCLUSION: The correlation developed based on the dimensional analysis and least square method predicts the mixing time for a double jet mixing tank. Copyright © 2009 Society of Chemical Industry

The response owing to inclined forces at an interface of a viscous fluid and a generalized thermoelastic micropolar honeycomb medium

The present investigation deals with the study of effect of change in angle of inclined forces at an interface of a viscous fluid/generalized thermoelastic micropolar honeycomb medium. The inclined load is assumed to be a linear combination of normal load and tangential load. The method of potential function, together with the application of integral transforms, has been applied to obtain the expressions of stresses and temperature distribution in the transformed domain. A particular type of boundary condition has been taken to illustrate the utility of the approach in three different cases, namely, time domain, frequency domain, and steady state, with the appropriate change of variables. A numerical inversion technique to invert the integral transforms is used on the transformed solution. The effect of micropolarity and change in angle of inclination is shown graphically owing to the response of different forces. Some particular cases of interest are also discussed.

Effect of Change in Angle between Microelectrode Surface and Jet Direction in Flow System on Current Response in Solutions of Different Ionic Strength

The influence of stream orientation versus surface of microelectrode detector was examined in the range between vertical and parallel flow for various jet velocities and various levels of supporting electrolyte. The flow cell was equipped with a conical body Pt microdisk electrode, and the measurements involved voltammetry and chronoamperometry. Ferrocene, two its charged derivatives (sodium ferrocenylo sulfate and ferrocenylomethyltrimethylamino hexafluorophosphate) and sodium iodide were employed as the substrates in the experiments. The strongest convectional transport and the highest signal of the analytes was obtained for alpha = 60 degrees (alpha is the angle between the electrode surface and the stream direction). The measured current increased by up to 1.85 times versus the traditional setup, and therefore, this new geometry of the detector is analytically advantageous. The value of alpha corresponding to the highest signal tended to decrease to approximately 45 degrees in the absence of supporting electrolyte provided that either flow rate or analyte concentration was above a certain threshold value. The experiments indicated that the interplay of the convectional and migrational components in the analyte transport is different for the charge increase and the charge cancellation processes. These experimental facts were confirmed by digital simulation results.