Numerical Simulation Of Secondary Flow Heat Transfer Characteristics On Channel

The development of heat transfer enhancement technology can reduce the cost of heattransfer equipment and it is an absolutely necessary requirement of energy conservation andpollutant reduction. The usage of secondary flow heat transfer enhancement is a kind ofpassive method, it uses some special devices to make fluid in the heat transfer spaceproducing secondary flow, in this way,the heat transfer efficiency will be improved. Inorder to better use secondary flow to enhance heat transfer process, firstly should find awidely used and quantitative parameter that can describe the intensity of secondary flow,based on this parameter, establishing the quantitative relationship between the intensity ofsecondary flow and the degree of heat transfer, finally finding effective ways by using heattransfer enhancement of secondary flow.In this paper,using numerical method to simulate the heat transfer process ofrectangular channel and circular channel that layed out vortex generators,analyzing thelocal heat transfer by secondary flow caused by vortex generators quantitatively andanalyzing the influence of secondary flow on heat transfer enhancement. The intensity ofsecondary flow in the channel is specified by using of the absolute vorticity flux parameterand the non-dimensional correspondence. Through the analysis of secondary flowintensity,putting forward the parameter that called the absolute vorticity magnitude andstating the physical meaning of the parameter,using absolute vorticity magnitude to have aquantitative description of comprehensive heat transfer enhancement effect in the processof fluid flowing in rectangular channel that layed out vortex generator,the contribution ofthe intensity of secondary flow to heat transfer enhancement and to the increase in flowresistance is quantified. Analyzing the effect of vortex generator’s structural parameters toconvective heat transfer characteristics, at the same time examining the relationshipbetween absolute vorticity flux and its corresponding dimensionless parameters and theconvective heat transfer intensity in rectangular channel and circular channel.