BOILING ON FREE-FALLING SPHERES: DRAG AND HEAT TRANSFER COEFFICIENTS

被引：38

作者：

Zvirin, Y. ^{[1
]}

Hewitt, G. F. ^{[2
,3
]}

Kenning, D. B. R. ^{[4
]}

机构：

[1] Technion Israel Inst Technol, Fac Mech Engn, IL-32000 Haifa, Israel

[2] Harwell Lab, Thermal Hydraul Div, London, England

[3] Univ London Imperial Coll Sci Technol & Med, Dept Chem Engn & Chem Technol, London, England

[4] Univ Oxford, Dept Engn Sci, Oxford OX1 3PJ, England

来源：

EXPERIMENTAL HEAT TRANSFER | 1990年 / 3卷 / 03期

关键词：

D O I：

10.1080/08916159008946386

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Experiments have been conducted to measure drag (c(D)) and heal transfer coefficients (h) and to study the boiling nature on healed spheres free-falling in saturated and subcooled water. Simultaneous measurements of the transient sphere velocity and temperature during the fall enabled calculation of c(D), heal fluxes, and h values. It has been found that the drag decreases with the initial sphere temperature, To. The measured results, as well as still and motion photography, show that at T(0) > 450 degrees C film boiling prevails, with low heal fluxes at the beginning of the transient. In some cases the film collapses, leading to a transition to disturbed-film and micro-bubble regimes, associated with larger heal fluxes and also solid-liquid interactions, with lateral motion of the sphere ("shoot-off").

引用

页码：185 / 214

页数：30

共 22 条

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