关键词: 短管效应, 气液两相流, 分离, 分液管, 管壳式冷凝器, 传热

Abstract: As to condensation in tube, the technology initiatives of the "short-tube effect" theory to maintain a relatively higher heat transfer coefficient are making intermediate separation of the liquid, and changing the flow regimes of gas-liquid flow, in order to keep the steam in the heat exchange tube at the inlet section at a high-efficient heat transfer state. Combined with the structure of traditional condenser, a horizontal-water cooling shell and tube condenser with liquid separation structure was designed for experimental study in this paper. Heat transfer effect was observed by different diameters and numbers of liquid separation pipes arranged at pass partition plate of condenser. The results were compared to the traditional condenser with respect to the overall heat transfer coefficient, outlet condensate temperature and pressure loss. It was shown that the condensers with different diameters and numbers of liquid separation pipes have similar thermal performance. The overall heat transfer coefficient of condensers with different diameters and numbers of liquid separation pipes is higher than that of the traditional condenser. The outlet condensate temperature is lower than that of the traditional condenser and has lower pressure loss. The condenser with liquid separation pipes with the diameter of 0.5mm and 1mm at right side and the pipes with the diameter of 1mm, 0.5mm at left side has a better comprehensive heat transfer performance under the test conditions.

Key words: short-tube effect, gas-liquid flow, separation, liquid separation pipes, shell and tube condenser, heat transfer