基于船用板式换热器脉动流强化换热实验研究

Experimental Study of Pulsating Flow Enhanced Heat Transfer of Plate Heat Exchanger in Ship

为探索和研究某型船用板式换热器在脉动流动下的传热特性,利用往复泵作为脉动源,将脉动源安装在冷水侧,以此来研究在脉动振幅0.03 MPa、不同频率、过渡流态下上游脉动对换热效率的影响。实验在Re(3 000~8 000)、脉动振幅0.03 MPa、脉动频率(0.5~1.1 Hz)参数条件下进行。实验结果表明:在加入脉动之后,板式换热器冷水路和热水路之间的热量传输速率大大提高;在脉动振幅0.03 MPa,Re为3774,脉动频率0.55 Hz时,换热效率提高了59.8%;并且随着Re增加,最弱脉动频率出现在0.66 Hz附近。

This paper aims to explore and study the heat transfer characteristics of pulsating flow of plate heat exchanger in certain type ship.The experiment uses reciprocating pump as a pulsation source,which installed in the cold water side,in order to study the effect of upstream pulsating to the heat transfer efficiency under the condition that pulsation amplitude0.03MPa,different frequencies and transition flow regime.Experiment is carried out under the conditions ofRe(3000~8000),the pulsation amplitude0.03MPa,pulse frequency(0.5~1.1Hz).The result shows that after pulsating flow is added,the heat transfer rate of the plate heat exchanger greatly improved between the cold water pipeline and hot water pipeline;when the pulsation amplitude is0.03MPa,Reynolds is3774,the pulsation frequency is0.55Hz,heat exchange efficiency can improve by59.8%;and as the Reynolds number increases,the weakest pulse frequency appears near0.66Hz.