1st International Conference on Fluid Dynamics
and Computational Science (FDCS 2022)
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Crosscheck Powered by iThenticate will be used for plagiarism check. The amount of duplication from previously published content should be less than 30%; If the amount of duplication is 30% - 40%, modification maybe required; if the amount of duplication exceeds 40%, the article will be rejected. Please note that there will be no refund for no-shows.
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A Best Paper presentation will be selected from each oral session based on the score of the Technical Session Chair. The Certificate for Best Paper Presentation will be awarded during the conference.
Jianghao Niu
Civil Aviation University of China,
China
Title: CFD Analysis of the Influence of Ionic Liquids on the Performances
of a Refrigeration System
The falling
film of an ionic liquid ([EMIM] [DMP] + H2O) and its effect on a refrigeration
system are numerically simulated in the framework of a Volume of Fluid (VOF)
method (as available in the ANSYS Fluent computational platform). The
properties of the liquid film and the wall shear stress (WSS) are compared with
those obtained for a potassium bromide solution. Different working conditions
are considered. It is noted that the ionic liquid demonstrates a better
absorption capability, with a coefficient of performance (COP) of 0.55. It is
proved that the [EMIM] [DMP] + H2O ionic liquid working substance is superior
to the potassium bromide solution in terms of heat and mass transfer.
Xiangxi Du
Xi’an Jiaotong University
Title: Study on the Gas-based
Lubrication of Elastic Foil Bearings Using an Over Relaxation Iteration Method
A new type of
foil bearings with a specific surface microstructure is studied. First,
relevant boundary conditions based on the assumption of rarefied gas flow are
proposed, then, the static bearing capacity and friction torque are analyzed in
the framework of a numerical technique based on the discretization of the
governing equation for rarefied gas-dynamics. It is shown that under the same
static load, the difference between the minimum film thickness calculated in
this exploration and the results provided by dedicated tests is not obvious;
with an increase in the load, the simulation results are closer to the test
values; when the bearing rotor speed is 60000r/min, the bearing capacity of the
new foil bearing with different foil groove depth is reduced by the effect of
the boundary slip. With an increase in the depth of the grooves on the surface
of the foil, the influence of the boundary slip effect increases; when the
eccentricity of the bearing increases, the gas pressure generated increases and
the bearing capacity increases.
Qifei Du
Tiangong University, China
Title: Analysis of the Thermal Behavior of a Lithium Cell Undergoing Thermal Runaway
This study examines the thermal runaway of a lithium ion battery caused by poor heat dissipation performances. The heat transfer process is analyzed on the basis of standard theoretical concepts. Water mist additives are considered as a tool to suppress the thermal runaway process. The ensuing behaviour of the battery in terms of surface temperature and heat generation is analyzed for different charge and discharge rates. It is found that when the remaining charge is 100%, the heat generation rate of the battery is the lowest, and the surface temperature with a 2C charge rate is higher than that obtained for a 0.5C charge rate. The experimental results show that when the additive concentration is 20% NaCl, its ability to inhibit the thermal runaway is the strongest.
Yafei Li
Southwest Petroleum University
Title: A Mathematical Model of Heat
Transfer in Problems of Pipeline Plugging Agent Freezing Induced by Liquid
Nitrogen
A mathematical
model for one-dimensional heat transfer in pipelines undergoing freezing
induced by liquid nitrogen is elaborated. The basic premise of this technology
is that the content within a pipeline is frozen to form a plug or two plugs at
a position upstream and downstream from a location where work a modification or
a repair must be executed. Based on the variable separation method, the present
model aims to solve the related coupled heat conduction and moving-boundary
phase change problem. An experiment with a 219 mm long pipe, where water was
taken as the plugging agent, is presented to demonstrate the relevance and
reliability of the proposed model (results show that the error is within 18%).
Thereafter, the model is applied to predict the cooling and freezing process of
pipelines with different inner diameters at different liquid nitrogen
refrigeration temperatures when water is used as the plugging agent.
Huali Guo
Guilin University of Aerospace
Technology
CFD Analysis and Optimization of an
Engine with a Restrictor Valve in the Intake System
In some competitions the rules clearly state that all participating cars must install a restrictor valve structure in the intake system of the engine. The intake air volume of the engine is considerably affected due to the existence of such a valve. Indeed, a small interface diameter through which gas flows can lead to considerable flow resistance and loss. In this study, a four-cylinder engine for FSC racing is analyzed using a combined method based on numerical simulation and experiments. The analysis reveals that the main factors affecting the intake air volume are the intake manifold and the volume of the resonance chamber. The influence of such factors is assessed using a single variable method and an optimal model and parameters are obtained accordingly. Comparison of different results show that the maximum torque for the optimized system is increased from the original 42.6 N·m to 46.9 N·m, thus demonstrating an increase of 10.6%. These findings provide a theoretical basis for the design of the intake system and the improvement of engine performance.
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