Effect of Surface Treatment on Flow Boiling Heat Transfer Coefficient in CaSO4 Containing Water

Abstract

Key words: deposit, surface modification, surface energy, flow boiling

摘要： This paper reports the influence of heat transfer surface treatment on the formation of calcium sulphate de-posit during flow boiling heat transfer. The surface of several test heaters was treated by surface modification techniques, such as dynamic mixing magnetron sputtering [DLC (diamond-like carbon), DLC-F (diamond-like carbon-fluorine) and AC (amorphous carbon)] and polishing to reduce surface energy. The results showed that heat transfer surface with low surface energy experienced significant reduction of formation of CaSO4 deposit. (1) Magnetron sputtering stainless steel heat transfer surface with DLC, DLC-F and plasma arc sputtering with AC did not change the surface roughness, but they reduced surface energy and improved heat transfer coefficient, so hindered CaSO4 deposit formation significantly. The DLC-F surface performed better than the DLC surface. (2) Surface energy played an important pole in improving heat transfer coefficient. The less the surface energy the more significant the heat transfer coefficient improved with other ex-perimental conditions identical. (3) The polished surface improved the roughness of the heater, but owing to the high sur-face energy it was not better than the DLC-F surface for a long-term consideration on improving the heat transfer coeffi-cient.

关键词: deposit;surface modification;surface energy;flow boiling

RENXiaoguang(任晓光),LITiefeng(李铁凤)andZHAOQi(赵起). Effect of Surface Treatment on Flow Boiling Heat Transfer Coefficient in CaSO4 Containing Water[J]. .

RENXiaoguang(任晓光),LITiefeng(李铁凤)andZHAOQi(赵起). Effect of Surface Treatment on Flow Boiling Heat Transfer Coefficient in CaSO4 Containing Water[J]. CIESC Journal.

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