Abstract Solid-liquid (S-L) interfacial thermal resistance (ITR) is one of the key phenomena in the microscopic system where the interface plays a role in thermal transport, such as nanofluids. The changes in the S-L ITR in the case of the nanoparticle adhesion and sedimentation had not been experimentally characterized until now. In the present study, we experimentally investigated the changes in the S-L ITR when the ZrO2 nanoparticle adhesion and sedimentation layer were formed on the stainless steel surface. We found that some portion of the nanoparticles inevitably adhered to the stainless steel surface. In the present study, the amount of the nanoparticle adhesion was not enough to change the macroscopic wettability and the S-L ITR. However, in the case of the nanoparticle sedimentation layer, the apparent S-L decreased, as the nanoparticle sedimentation became thicker. The tendency was consistent with the present thermal resistant model of the nanoparticle sedimentation layer. The nanoparticle sedimentation layer did not substantially influence the true S-L ITR. The above-mentioned findings are the basic knowledge that is beneficial and helpful for better understanding and designing the thermal conductivity measurements of the nanofluids, as well as the nanofluids heat transfer in flow channels.

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纳米颗粒粘附沉降层对固液界面热阻影响的实验研究

摘要 固液 (SL) 界面热阻 (ITR) 是微观系统中的关键现象之一，其中界面在纳米流体等热传输中发挥作用。在纳米颗粒粘附和沉降的情况下，SL ITR 的变化直到现在还没有被实验表征。在本研究中，我们通过实验研究了在不锈钢表面形成 ZrO2 纳米颗粒粘附和沉淀层时 SL ITR 的变化。我们发现部分纳米颗粒不可避免地粘附在不锈钢表面上。在本研究中，纳米颗粒的粘附量不足以改变宏观润湿性和 SL ITR。然而，在纳米颗粒沉降层的情况下，表观SL降低，随着纳米颗粒沉淀变得更厚。该趋势与目前纳米颗粒沉降层的耐热模型一致。纳米颗粒沉降层基本上不影响真正的 SL ITR。上述发现是有益和有助于更好地理解和设计纳米流体的热导率测量以及纳米流体在流道中的传热的基础知识。