CAJ | 학술논문

采用模拟方法对海水淡化装置中大型水平管降膜蒸发器内的流动过程进行实验研究．管束采用海水淡化装置中广泛应用的正三角形和转角正方形排列，其管间距为1．3倍管外径．实验在饱和温度为50～70℃，喷淋密度为0．02～0．08 kg · m -1· s-1的条件下进行．分析了管束排列方式、喷淋密度和饱和温度等因素对流动阻力的影响．实验结果表明，流动阻力在正三角形管束下比在转角正方形管束下大得多．引入 Rel 、Reg 、slo/D、str/D等参数来表征各个影响因素并用来拟合有降膜流动时蒸汽横掠管束的压降预测公式．新拟合的公式误差在±15％以内．
채용모의방법대해수담화장치중대형수평관강막증발기내적류동과정진행실험연구．관속채용해수담화장치중엄범응용적정삼각형화전각정방형배렬，기관간거위1．3배관외경．실험재포화온도위50～70℃，분림밀도위0．02～0．08 kg · m -1· s-1적조건하진행．분석료관속배렬방식、분림밀도화포화온도등인소대류동조력적영향．실험결과표명，류동조력재정삼각형관속하비재전각정방형관속하대득다．인입 Rel 、Reg 、slo/D、str/D등삼수래표정각개영향인소병용래의합유강막류동시증기횡략관속적압강예측공식．신의합적공식오차재±15％이내．
Experiments are carried out to simulate the flow characteristics in a large horizontal falling film evaporator of desalination plant .The tube bundle arrangements are regular triangle and rotated square ,and the relative tube bundle-pitch ratio is 1 .3 , a typical value for evaporators used in desalination .Experiments are conducted with saturated temperature ranging from 50 ℃ to 70 ℃ and spray density ranging from 0 .02 kg·m-1·s-1to 0. 08kg·m-1·s-1. The influences of these factors ,such as tube arrangement ,spray density and saturated temperature on steam flow resistance are analyzed .The experimental results show that the steam flow resistance across regular triangle tube bundle is bigger than that across rotated square tube bundle .Parameters Rel ,Reg ,slo/D ,str/D are employed to fit the prediction formula .Based on the experimental data ,a pressure drop correlation for steam flowing across horizontal tube bundle with falling film is proposed with a standard deviation of ± 15% .