江苏科技大学学报(自然科学版)
江囌科技大學學報(自然科學版)
강소과기대학학보(자연과학판)
JOURNAL OF JIANGSU UNIVERSITY OF SCIENCE AND TECHNOLOGY(NATURAL SCIENCE EDITION)
2014年
5期
461-465
,共5页
有限体积法%基元中心法%非牛顿流体%偏心圆环管
有限體積法%基元中心法%非牛頓流體%偏心圓環管
유한체적법%기원중심법%비우돈류체%편심원배관
FVM%cell-based central method%non-Newtonian fluid%eccentric annular channel
以剪切应力符合Ostwald-de Waele关系式的幂律非牛顿流体为研究对象。针对幂律非牛顿流体的表观黏度随剪切速率变化且计算过程有别于牛顿流体的问题,运用基元中心法对非线性粘性系数进行离散。采用有限体积法对幂律非牛顿流体在偏心圆环管中的充分发展层流流动和传热进行数值计算。计算结果表明流体的幂律因子对流动的影响较大,但对传热的影响受到到偏心率的影响。流道偏心会引起圆环通道内速度和温度的周向分布不均匀,且偏心程度越严重,周向分布不均匀性越强烈。
以剪切應力符閤Ostwald-de Waele關繫式的冪律非牛頓流體為研究對象。針對冪律非牛頓流體的錶觀黏度隨剪切速率變化且計算過程有彆于牛頓流體的問題,運用基元中心法對非線性粘性繫數進行離散。採用有限體積法對冪律非牛頓流體在偏心圓環管中的充分髮展層流流動和傳熱進行數值計算。計算結果錶明流體的冪律因子對流動的影響較大,但對傳熱的影響受到到偏心率的影響。流道偏心會引起圓環通道內速度和溫度的週嚮分佈不均勻,且偏心程度越嚴重,週嚮分佈不均勻性越彊烈。
이전절응력부합Ostwald-de Waele관계식적멱률비우돈류체위연구대상。침대멱률비우돈류체적표관점도수전절속솔변화차계산과정유별우우돈류체적문제,운용기원중심법대비선성점성계수진행리산。채용유한체적법대멱률비우돈류체재편심원배관중적충분발전층류류동화전열진행수치계산。계산결과표명류체적멱률인자대류동적영향교대,단대전열적영향수도도편심솔적영향。류도편심회인기원배통도내속도화온도적주향분포불균균,차편심정도월엄중,주향분포불균균성월강렬。
This paper studies power-law non-Newtonian fluid where the shearing stress accords with the Ostwald-de Waele relational formula.It aims to solve the problem of the apparent viscosity changing with the shearing rates and the calculation which is different from Newtonian fluid.Cell-based central method is used for the non-linear viscosity coefficient discretization.It adopts FVM for flow and heat transfer numerical simulation of fully developed laminar in eccentric annular channel.The calculation results show that the power-law factor has a great impact on the fluid flow,but the impact on the heat transfer is influenced by the eccentricity .The eccentric-ity of annular channel can lead to the asymmetrical distribution of circumferential temperature and velocity.