【摘要】 建立了换热器壳程流速分布不均匀对传热性能影响的数学模型 ,并从管内轴向流传热与管外横向流传热两个方面 ,研究了换热器因流道来流流速分布不均匀而造成的传热负荷偏移 .研究结果表明 ,流速不均匀分布对换热器传热性能影响不大 ;在恒壁温、各流道间无热交换的条件下 ,当各流道流速不均达到 1 0 0 %时 ,换热器的传热负荷偏移在1 %以内 .更多还原

【Abstract】 A mathematical model of the effect of velocity dis tribution asymmetry in heat exchanger channels on the heat transfer performance was formulated. The deviation of heat transfer duty in heat exchangers caused by the asymmetry was i nvestigated when the fluid flowed inside the tubes or across the tube bundles. R esearch results indicate that the effect of velocity distribution asymmetry in e xchanger channels on the heat transfer performance is not great. The deviation o f heat transfer duty inside the tubes and across the tube bundles are both less than 1% when the velocity difference reaches 100% at uniform wall temperatur e and without heat transfer among channels.更多还原