天津科技大学学报
天津科技大學學報
천진과기대학학보
JOURNAL OF TIANJIN UNIVERSITY OF SCIENCE & TECHNOLOGY
2014年
6期
65-73
,共9页
温度%聚结%液滴%平均流剖面%热导率
溫度%聚結%液滴%平均流剖麵%熱導率
온도%취결%액적%평균류부면%열도솔
temperature%coalescence%drop%mean flow profile%thermal conductivity
推导了扩散相液滴运动轨迹模型和温度场中平均流修正模型，并优化了计算方法。直接数值模拟结果表明：平均温度和温度分布方式不同都会引起温度剖面和平均流剖面发生相应的变化，但它们的表现形式各不相同。因为温度场的变化会改变液滴所受到的不平衡剪应力，所以温度不同液滴的运动轨迹也不同，这种变化的动力来源于温度剖面和平均流剖面发挥的作用，它显著地影响液滴的聚结效率，因此，适当地调节流场温度可以改善流场的聚结条件。在层流流场中液滴的运动方式受温度分布的影响具有一定的随机性，但随机变化因素中包含确定性因素。液滴的聚结效率在一定程度上依赖于流场的平均温度，但温度分布方式也是影响聚结效率的不可忽视的因素，温度是理论反演计算和简化工程计算的必要条件。
推導瞭擴散相液滴運動軌跡模型和溫度場中平均流脩正模型，併優化瞭計算方法。直接數值模擬結果錶明：平均溫度和溫度分佈方式不同都會引起溫度剖麵和平均流剖麵髮生相應的變化，但它們的錶現形式各不相同。因為溫度場的變化會改變液滴所受到的不平衡剪應力，所以溫度不同液滴的運動軌跡也不同，這種變化的動力來源于溫度剖麵和平均流剖麵髮揮的作用，它顯著地影響液滴的聚結效率，因此，適噹地調節流場溫度可以改善流場的聚結條件。在層流流場中液滴的運動方式受溫度分佈的影響具有一定的隨機性，但隨機變化因素中包含確定性因素。液滴的聚結效率在一定程度上依賴于流場的平均溫度，但溫度分佈方式也是影響聚結效率的不可忽視的因素，溫度是理論反縯計算和簡化工程計算的必要條件。
추도료확산상액적운동궤적모형화온도장중평균류수정모형，병우화료계산방법。직접수치모의결과표명：평균온도화온도분포방식불동도회인기온도부면화평균류부면발생상응적변화，단타문적표현형식각불상동。인위온도장적변화회개변액적소수도적불평형전응력，소이온도불동액적적운동궤적야불동，저충변화적동력래원우온도부면화평균류부면발휘적작용，타현저지영향액적적취결효솔，인차，괄당지조절류장온도가이개선류장적취결조건。재층류류장중액적적운동방식수온도분포적영향구유일정적수궤성，단수궤변화인소중포함학정성인소。액적적취결효솔재일정정도상의뢰우류장적평균온도，단온도분포방식야시영향취결효솔적불가홀시적인소，온도시이론반연계산화간화공정계산적필요조건。
A trajectory model of dispersed phase drops and A modified model of basic flow in the temperature field between two inclined parallel plates were derived with the optimized calculation. The analytical results of direct numerical simulation indicate that the difference of both the mean temperature and temperature distribution may lead to changes of mean flow profiles and temperature profiles,but their functions are very different. The trajectories of a drop may vary with the changes of unbalanced shearing force acting on a drop induced by temperature field. The dynamic sources of changeable processes stem from the action of mean flow profiles and temperature profiles,which have a great effect on the coalescence efficien-cies. Hence,the coalescence conditions of the flowing field may be improved by the proper adjustment of temperature in the flowing field. Although the flowing field is in the laminar flow state,temperature distribution leads to the fact that in the change of drop motion,there are not only stochastic factors but also determinate factors. The difference in the degree of coa-lescence efficiency depends on the mean temperature to a certain extent,but the temperature distributions are indispensable to coalescence efficiency. The factors of temperature field are indispensable to sovling the theoretical simplification of the inverse operation and engineering calculation.
