ABSTRACT

Impact of using V-cuts twisted tape insert and phase change material (PCM) dispersed mono or hybrid nanofluid on the hydrothermal characteristics of the double tube heat exchanger is experimentally investigated. Water-based Al₂O₃ and PCM nanofluids and Al₂O₃+ PCM hybrid nanofluid with different concentrations are used in inner tube. Influences of various geometric parameters of V-cuts twisted tape insert on heat transfer, pressure drop and entropy generation are investigated. Results reveal that heat transfer and pressure drop increase with the increase in particle concentration and decrease in twisting ratio. A higher V-cut depth ratio or lower width ratio yields more heat transfer and pressure drop.

摘要

实验研究了使用 V 形切割扭曲带插入物和相变材料 (PCM) 分散的单或混合纳米流体对双管换热器的水热特性的影响。内管采用不同浓度的水基Al ₂ O ₃和PCM纳米流体以及Al ₂ O ₃ + PCM混合纳米流体。研究了 V 形切割扭曲带插入件的各种几何参数对传热、压降和熵产生的影响。结果表明，传热和压降随着颗粒浓度的增加和扭曲比的减小而增加。更高的 V 形切割深度比或更低的宽度比会产生更多的热传递和压降。