ABSTRACT

An experimental study involving tapered wire coil inserts in a double-tube heat exchanger using water-based phase change material (PCM)-dispersed mono/hybrid nanofluids is conducted. The effects of the wire coils (WC) with nanofluids on the hydrothermal performance of this system are studied for different coil arrangements: converging wire coils (CWC), diverging wire coils (DWC), and converging-diverging wire coils (CDWC) and different Reynolds numbers. The experimental results indicate that among all the tested coil arrangements, the DWC presents a higher thermal performance factor (TPF) than the other arrangements. Using the DWC, the TPF of the Al₂O₃+PCM hybrid nanofluid is augmented by 3.98%, 9.61%, and 3.04% as compared to that for the plain wire coil (PWC), CWC, and CDWC, respectively. Besides, the DWC configuration exhibits the minimum entropy generation among all arrangements. For the Al₂O₃+PCM hybrid nanofluid using the DWC, the entropy generation is decreased by approximately 13.36%, 9.78%, and 5.78% as compared to that of the PWC, CWC, and CDWC at a volumetric flow rate of 15 lpm.

摘要

进行了一项实验研究，涉及使用水基相变材料（PCM）分散的单一/混合纳米流体在双管热交换器中插入锥形线圈。研究了不同线圈布置的纳米流体线圈（WC）对该系统水热性能的影响：会聚线圈（CWC）、发散线圈（DWC）和会聚-发散线圈（CDWC）和不同的线圈布置。雷诺数。实验结果表明，在所有测试的线圈布置中，DWC 比其他布置具有更高的热性能因数 (TPF)。使用 DWC，Al ₂ O _{3的 TPF}与平线线圈 (PWC)、CWC 和 CDWC 相比，+PCM 混合纳米流体分别增强了 3.98%、9.61% 和 3.04%。此外，DWC 配置在所有配置中表现出最小的熵产生。对于使用DWC的Al ₂ O ₃ +PCM混合纳米流体，在体积流量为15 lpm时，与PWC、CWC和CDWC相比，熵产生减少了约13.36%、9.78%和5.78% 。