【摘要】 对双面加热环形窄缝通道内单相水处于充分发展流动情况下的对流换热特性进行了数值计算.计算结果表明,环形通道内、外壁加热热流密度比的不同,对环形通道内、外壁与单相水的对流换热特性有着显著的影响.当内、外壁加热热流密度比较小时,内壁的换热强于外壁,随着内、外壁加热热流密度比的增大,外壁的换热得到增强.但是,当内、外壁加热热流密度比增加到一定程度时,外壁的对流换热特性将超过内壁的对流换热特性.此外,环缝间隙的减小将导致环形通道的换热性能下降.更多还原

【Abstract】 Numerical research was carried out on the convection heat transfer characteristics(in bilaterally)heated narrow annuli under the conditions of fully developed flow,where the inner and outer walls were heated by uniform but unequal heat fluxes.The results show that the parameter ω,the ratio of the inner wall heat flux to the outer wall heat flux,has great influences on the heat transfer characteristics in bilaterally heated narrow annuli.With the increase of the inner wall heating flux,the heat transfer coefficient at the outer wall of the inner tube will decrease,while the heat transfer coefficient at the inner wall of outer tube will increase.In addition,the decrease of the annuli gap will yield heat transfer deterioration during flowing in narrow annular(channels.)更多还原