Numerical simulation of heat transfer of supercritical LNG fluid with variable physical properties in microchannels
The physical properties of transcritical LNG vary significantly near the critical point.The flow and heat transfer performance of supercritical LNG with variable and constant physical properties in straight channels and Zigzag type microchannels were studied by numerical simulation method,and the deviation between LNG transcritical variable and constant physical properties was analyzed.The research results indicate that the deviation of convective heat transfer coefficients between the constant and variable properties of the straight channel are 1.95％,-3.37％,-6.48％,and-9.11％and the deviation of the Zigzag channel is-0.11％,-5.47％,-7.84％,and-5.83％.The convective heat transfer coefficient of Zigzag varies periodically according to the pitch.The increase of vortices near the semicircle angle has a good strengthening effect on heat transfer.In the straight channel and Zigzag channel,the pressure drop of variable physical properties is smaller than that of constant physical properties,but the friction factor f is greater than that of constant physical properties.The influence of physical prop-erties on f in the Zigzag channel can be ignored.
万方数据
维普
