【摘 要】
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The effect of surface tension on flow condensation in vertical small tube with inside diameter of 1-5 mm is compared with that of gravity and shear stress in di
【机 构】
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Thermal Engineering Department
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The effect of surface tension on flow condensation in vertical small tube with inside diameter of 1-5 mm is compared with that of gravity and shear stress in different gravity environments at low Reynolds number, whichis less concerned in former studies. The present study indicates that surface tension is the most important factor affectingflow condensation, but it is weakened by shear stress as decreasing tube diameter in a microgravity environment. In anormal gravity environment, body force is the dominant effect that is weakened by shear stress as decreasing tube diame-ter, while the effect of capillary pressure drop due to surface tension is enhanced. The work will be helpful in under-standing the characteristics of heat pipe or capillary pumped loop (CPL) at low Reynolds number.
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