【摘要】 对螺旋折流板换热器的流动及换热特性进行了试验研究与分析。结果表明,当保持螺旋周期为定值时,在相同流量下和相同壳径下,螺旋折流板换热器的壳侧压降随螺旋角增大而减小,且远低于弓形折流板的管壳式换热器;壳径减小时,压降增加明显。相同Re下,螺旋折流板换热器的壳侧换热系数低于弓形折流板,在螺旋角为40°时达到最大值。相同流量下,螺旋折流板管壳式换热器单位压降和单位泵功下的换热系数均高于弓形折流板管壳式换热器。更多还原

【Abstract】 The flow and heat transfer characteristics in helically baffled shell and tube heat exchangers were studied experimentally.The results show that,when the helix cycle is fixed,for the same flow rate,the pressure drop of the shell side of helical baffled heat exchanger decreases with the increase of helix angle,and is far lower than that of segmental baffle heat exchanger;as the shell diameter decreases,the pressure drop increase markedly.For the same Re number,the shell side heat transfer coefficients for helical baffled heat exchanger are lower than those for segmental baffle heat exchanger, and reach the maximum when the helix angle is 40 degrees.At the same flow rate,the helical baffle shell-tube heat exchanger has a higher heat transfer coefficient than that of segmental baffled heat exchanger for both per unit pressure drop and per unit pump power.更多还原