Pool boiling heat transfer of water and nanofluid outside the surface with higher roughness and different wettability |
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Authors: | Wen-Tao Ji Peng-Fei Zhao Chuang-Yao Zhao Jing Ding Wen-Quan Tao |
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Affiliation: | Key Laboratory of Thermo-Fluid Science and Engineering of MOE, Xi’an Jiaotong University, Xi’an, China |
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Abstract: | In order to investigate the effect of surface wettability on the pool boiling heat transfer, nucleate pool boiling experiments were conducted with deionized water and silica based nanofluid. A higher surface roughness value in the range of 3.9 ~ 6.0μm was tested. The contact angle was from 4.7° to 153°, and heat flux was from 30kW/m2 to 300kW/m2. Experimental results showed that hydrophilicity diminish the boiling heat transfer of silica nanofluid on the surfaces with higher roughness. As the increment of nanofluid mass concentration from 0.025% to 0.1%, a further reduction of heat transfer coefficient was observed. For the super hydrophobic surface with higher roughness (contact angle 153.0°), boiling heat transfer was enhanced at heat flux less than 93 kW/m2, and then the heat transfer degraded at higher heat flux. |
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Keywords: | Super hydrophilic super hydrophobic pool boiling heat transfer |
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