Experimental And Numerical Simulation Of Fluid Flow In Grooved Channel For Heat Exchanger

With the growth of economy, energy-saving, cost-reducing and efficiency-increasing have been the energy development objectives of every country. Through research and innovation, a series of energy-saving technologies come into being. The flow path with roughness element inside is taken as an efficient way, which strengthens convection heat and mass transfer. Research shows that fluid in the shape tube or channel is easier to get separated, contributing to higher transmission efficiency than in the straight wall pipe or channel, which is meaningful in optimizing performance of equipment. It’s essential to take advantages of the devices about enhancement of heat and mass transfer to improve overall equipment efficiency and reduce life-cycle cost.This paper takes one type of two-dimensional channels used in heat exchanger as research objective. The formation is that plate channel is added the groove roughness. Experimental and numerical simulation methods are used in research about different kinds of grooved channel. A lot of results are obtained.From the results, a few phenomenon and laws are concluded, that the groove affects the fluid flow of the whole channel.The groove obviously increases the channel resistance and the longer the length of channel is, the higher the friction factor is. But the use of groove can lead to the advance of flow transition and make turbulent flow under low flow speed. The groove changes the flow structure in channel. Fluid is divided into a new part and held up in the groove, forming a vortex. With flow variation, the structure and stability changes gradually. The groove also affects the hydrodynamics characteristics of channel. Different with the plate channel, the groove cause periodic breaks of wall shear stress. This tendency can lead to strong perturbation action and transfer reinforcement. The scale between the groove length and no-groove length is an important factor. By comparison, it’s better to have close lengths of the two parts, which has greater change in wall shear stress and larger value in the wall shear stress.