Effect of heat flux and inlet temperature on the fouling characteristics of nanoparticles |
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Authors: | Jingtao Wang Zhiming Xu Zhimin Han Yu Zhao |
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Affiliation: | College of Energy and Power Engineering, Northeast Electric Power University, Jilin 132012, China |
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Abstract: | In order to study the effect of heat flux and inlet temperature on the fouling characteristics of nanoparticles, and to further reveal the fouling mechanism for insights into proper operating conditions, γ-Al2O3/water suspensions were chosen as the subject of this research. The particulate fouling characteristics of γ-Al2O3/water suspensions on the surface of stainless steel have been experimentally studied by varying the heat flux and the inlet temperature under single-phase flow and subcooled-flow boiling conditions. The results show that in the condition of single-phase flow, the asymptotic value of fouling resistance decreases with increasing of heat flux and inlet temperature. The asymptotic value of fouling resistance under single-phase flow is much higher than for the subcooled-flow boiling condition. The effect of heat flux on the fouling resistance under the two flow states has an inverse relationship, and there exists a minimum value of fouling resistance between these two states. For subcooled-flow boiling, the asymptotic value of fouling resistance increases with increasing heat flux, whereas the effect on fouling resistance by the inlet temperature is negligible. |
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Keywords: | Inlet temperature Heat flux Particulate fouling characteristics Single-phase flow Subcooled-flow boiling |
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