Faris Abdullah Mahir, Zulkifli Rozli, Harun Zambri, Abdullah Shahrir, Wan Ghopa Wan Aizon, Soheil Najm Asmaa, Humam Sulaiman Noor
Department of Mechanical and Materials Engineering, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.
Department of Electrical and Electronic Engineering, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.
Micromachines (Basel). 2019 Mar 7;10(3):176. doi: 10.3390/mi10030176.
Here, the researchers carried out an experimental analysis of the effect of the TiO₂ nanosolution concentration on the heat transfer of the twin jet impingement on an aluminum plate surface. We used three different heat transfer enhancement processes. We considered the TiO₂ nanosolution coat, aluminum plate heat sink, and a twin jet impingement system. We also analyzed several other parameters like the nozzle spacing, nanosolution concentration, and the nozzle-to-plate distance and noted if these parameters could increase the heat transfer rate of the twin jet impingement system on a hot aluminum surface. The researchers prepared different nanosolutions, which consisted of varying concentrations, and coated them on the metal surface. Thereafter, we carried out an X-ray diffraction (XRD) and a Field Emission Scanning Electron Microscopy (FESEM) analysis for determining the structure and the homogeneous surface coating of the nanosolutions. This article also studied the different positions of the twin jets for determining the maximal Nusselt number (Nu). The researchers analyzed all the results and noted that the flow structure of the twin impingement jets at the interference zone was the major issue affecting the increase in the heat transfer rate. The combined influence of the spacing and nanoparticle concentration affected the flow structure, and therefore the heat transfer properties, wherein the Reynolds number (1% by volume concentration) maximally affected the Nusselt number. This improved the performance of various industrial and engineering applications. Hypothesis: Nusselt number was affected by the ratio of the nanoparticle size to the surface roughness. Heat transfer characteristics could be improved if the researchers selected an appropriate impingement system and selected the optimal levels of other factors. The surface coating with the TiO₂ nanosolution also positively affected the heat transfer rate.
在此，研究人员对二氧化钛纳米溶液浓度对铝板表面双射流冲击传热的影响进行了实验分析。我们采用了三种不同的强化传热过程。我们考虑了二氧化钛纳米溶液涂层、铝板散热器和双射流冲击系统。我们还分析了其他几个参数，如喷嘴间距、纳米溶液浓度和喷嘴到板的距离，并记录这些参数是否能提高双射流冲击系统在热铝板表面的传热速率。研究人员制备了不同浓度的纳米溶液，并将它们涂覆在金属表面。此后，我们进行了X射线衍射（XRD）和场发射扫描电子显微镜（FESEM）分析，以确定纳米溶液的结构和均匀表面涂层。本文还研究了双射流的不同位置，以确定最大努塞尔数（Nu）。研究人员分析了所有结果，并指出干涉区双冲击射流的流动结构是影响传热速率增加的主要问题。间距和纳米颗粒浓度的综合影响影响了流动结构，进而影响了传热性能，其中雷诺数（体积浓度为1%）对努塞尔数的影响最大。这改善了各种工业和工程应用的性能。假设：努塞尔数受纳米颗粒尺寸与表面粗糙度之比的影响。如果研究人员选择合适的冲击系统并选择其他因素的最佳水平，传热特性可以得到改善。二氧化钛纳米溶液的表面涂层也对传热速率产生了积极影响。
