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首页> 外文期刊>International Journal of Heat and Mass Transfer >Drainage of frost melt water from vertical brass surfaces with parallel microgrooves
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Drainage of frost melt water from vertical brass surfaces with parallel microgrooves

机译：带有平行微槽的垂直黄铜表面的霜融化水排出

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摘要

Drainage of frost melt water from a number of microgrooved brass surfaces, fabricated by micro-end-milling process, is investigated experimentally and compared to that of a flat baseline surface. Frost is grown on sample surfaces (45 mm × 45 mm in dimension) inside a thermally controlled chamber, at a plate temperature of about -25 ℃ in the presence of cold air (-6 ℃) and retention of water on these surfaces after defrosting is studied for three different defrosting energy inputs. Microgrooved surfaces drain up to 70% more condensate than does the flat baseline. The groove geometry is found to considerably affect the water retention. Drainage is promoted by an increase in the pillar width but is relatively insensitive to the changes in the groove depth. Effects of defrosting heating rate on the frost surface temperature and substrate temperature during defrosting process is also investigated. Frost mass per unit area is found to be lower for the grooved surfaces in the 1st frost and 2nd frost cycles.
机译：实验研究了通过微端面铣削加工制造的许多微沟槽黄铜表面上的霜融水的排水情况，并将其与平坦的基准表面进行了比较。在温控室内的样品表面（尺寸为45 mm×45 mm）上，在板温度约为-25℃且存在冷空气（-6​​℃）的情况下会结霜，除霜后这些表面上会保留水分研究了三种不同的除霜能量输入。与平坦的基线相比，微沟槽表面排放的冷凝物最多多出70％。发现凹槽的几何形状会显着影响保水率。立柱宽度的增加促进了排水，但对沟槽深度的变化相对不敏感。还研究了除霜加热速率对除霜过程中霜表面温度和基质温度的影响。在第一个霜冻和第二个霜冻循环中，开槽表面的单位面积霜冻质量较低。

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