A series of tests was conducted to unlock the potential application of MgO/water-EG (ethylene glycol) nanofluids (NF) in a double-pipe heat exchanger (HEX). The overall heat transfer coefficient (HTC), the inlet temperature of the working fluid, the fluid pressure drop (FPD), friction factor (FF) and the hydraulic performance index of the NF within the HEX were experimentally measured. Fouling of nanoparticles (NPs) within the Hex was also studied and modelled using asymptotic particulate fouling model. Results showed that MgO NPs can enhance the HTC by 39% at Re=10,500 and wt.% = 0.3 in the turbulent regime. Also, the presence of MgO NPs augmented the FF and the FPD values. The former was enhanced 33.8%, while the latter was augmented by 37% both at wt.% = 0.3 and at Reynolds number = 10,500. Results also revealed that the formation of porous particulate fouling layer on the internal wall of the inner tube creates a fouling thermal resistance which changes asymptotically with time. Overall, MgO/water-ethylene glycol shows a great potential to be used as a coolant within a HEX.

进行了一系列测试以释放MgO /水-EG（乙二醇）纳米流体（NF）在双管热交换器（HEX）中的潜在应用。实验测量了总传热系数（HTC），工作流体的入口温度，流体压降（FPD），摩擦系数（FF）和NF内NF的水力性能指标。还研究了Hex中纳米颗粒（NPs）的结垢情况，并使用渐近颗粒结垢模型进行了建模。结果表明，MgO NPs在Re =时可将HTC增强39％在湍流状态下为10,500和wt。％= 0.3。同样，MgO NPs的存在增加了FF和FPD值。前者提高了33.8％，而后者在wt。％= 0.3和雷诺数= 10,500时均提高了37％。结果还表明，在内管内壁上形成多孔颗粒结垢层会产生结垢热阻，该结垢热阻会随时间渐近变化。总体而言，MgO /水-乙二醇显示出在十六进制中用作冷却剂的巨大潜力。