Numerical Simulation On Flow And Heat Transfer Characteristics Of Nanofluids In Plate Heat Exchanger

Heat exchanger is an indispensable process equipment in engineeringapplication, plate heat exchanger (PHEs) because of its compact structure, highefficiency, suitable for different load, flexible and convenient health, is widely usedin petroleum, chemical, refrigeration and many other engineering fields.Nowadays,low heat transfer performance of heat transfer working medium has become themain obstacle of the research on the new generation of highly efficient heat transfercooling technologya. And an effective way to improve the heat transfer performanceof the liquid is adding solid particles in the liquid.This article attempts to take theCu-water nanofluids as cold fluid and uses it in plate heat exchanger, obtainstemperature field, heat transfer coefficient and the spatial distribution of flow fieldof Nanofluids heat in different working conditions by numerical simulation methodand analys the flow and heat transfer characteristics of Cu-water nano fluid in theplate heat exchanger to explore the most economical way of the application ofnanofluids, promote the thorough development of the energy conservation andemissions reduction in China.First of all, in this paper, the mass concentration of0.1%,0.3%,0.5%,0.7%ofCu-water nanofluids are simulated. Respectively to study the mass fraction ofnanofluids and Re number make influence on the convective heat transfer coefficient,and the simulation results with the experimental results are compared. Through thesimulation results, heat exchanger heat transfer effect of Cu-water nanofluids issuperior to pure water, but while improving velocity and increasing theconcentration of nanofluids, should give full consideration to viscosity increase leadto affect the performance of heat exchanger with the increasing of pressure drop atthe same time.Secondly, Improvement on the basis of the original model, the nano fluid in unilateral flow plate heat exchanger and diagonal flow cases are simulatedrespectively. The paper studied under different flow form, the Re number influenceon convective heat transfer coefficient and nusselt number change.Throughsimulation, nano fluid can improve the performance of the plate heat exchanger withnanofluids as unilateral cold fluid flow of plate heat exchanger improved heattransfer effect is best.Finally comprehensive conclusion: Cu-water nanofluids can improve the heattransfer performance of plate heat exchanger, the mass fraction of0.5%Cu-waternanofluids has the best heat transfer effect, nanofluid in the heat transfer coefficientof unilateral flow condition above the diagonal movement, flow and pressure drop isless than the diagonal...