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Cuihua Wang,Duo Rong,Wenquan Zhang,Bin Gong,Jianhua Wu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.9
The flow and heat transfer characteristics of magnetic nanofluids in a circular channel under the action of magnetic fields were studied through numerical simulation based on the finite element method. The results show that there are obvious secondary vortices on the cross-section, and a swirling flow is formed in the duct under the coupling effects of the magnetic field, velocity distribution, and thermal variations which destroys the boundary layer, accelerates the mixing of fluids, and enhances heat transfer. In the studied range, the maximum heat transfer coefficient can be increased by 102.65 %, and the maximum comprehensive heat transfer factor J is 1.69 compared to the ferrofluid not affected by the external magnetic field. In addition, the effect of enhancing heat transfer gradually decreases with the increase of θ, until heat transfer is slightly inhibited when the magnetic field is parallel to the flow direction.
Xe Distribution in Xe-ion Implanted NaCl Crystal
Xiaoyun Le,Cuihua Rong,X. P. Zhou,Jiachang Liang,Zhi Liu 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.-
Former experimental results show that solid-state alkali-Xe cluster could be formed in xenon-ion-implanted alkali halide crystal. This kind of cluster makes solid state alkali metal-xenon nano-materials potential candidates for preparing UV micro-laser matrix. By means of Rutherford Backscattering Spectrometry (RBS) and TRIM codes, Xe atom distributions are studied in this paper. The results show that Xe was found at a depth of around 250 nm. As xenon concentration increased, the number of metallic Na colloids increased as well. These metallic Na colloids were found in SEM images of our irradiated samples, and the formation of solid-state NaXe clusters in NaCl implanted by 129Xe has been used to explain the results in this paper. Former experimental results show that solid-state alkali-Xe cluster could be formed in xenon-ion-implanted alkali halide crystal. This kind of cluster makes solid state alkali metal-xenon nano-materials potential candidates for preparing UV micro-laser matrix. By means of Rutherford Backscattering Spectrometry (RBS) and TRIM codes, Xe atom distributions are studied in this paper. The results show that Xe was found at a depth of around 250 nm. As xenon concentration increased, the number of metallic Na colloids increased as well. These metallic Na colloids were found in SEM images of our irradiated samples, and the formation of solid-state NaXe clusters in NaCl implanted by 129Xe has been used to explain the results in this paper.