Heat transfer and hydrodynamics analysis of a novel dimpled tube
Heat transfer and hydrodynamics analysis of a novel dimpled tube
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新型波纹管的传热和流体动力学分析
DOI：
10.1016/j.expthermflusci.2010.05.008
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发表时间：
2010-11
影响因子：
3.2
通讯作者：
Lei, Yong-Gang
中科院分区：
文献类型：
--
作者：
Wang, Yu;He, Ya-Ling;Zhang, Jie;Lei, Yong-Gang
本文对一种新型椭圆凹窝强化传热管进行了传热和流体力学分析。所述凹窝布置成椭球长轴与流动方向之间形成一定的指定角度，并且在同一横截面内相邻的每个椭球凹窝的长轴方向交替。实验试验采用壳体侧恒定流量的热水，管侧流量为1 ~ 55m3/h的冷空气。测量了两侧入口和出口的温度和压力。研究了新型微窝管的传热和压降，并与球面微窝微窝管和普通光滑微窝管的传热和压降结果进行了比较。计算结果表明，椭球窝管和球形窝管的努塞尔数分别比光滑管高38.6 ~ 175.1%和34.1 ~ 158%。与光滑管相比，椭球窝和球形窝的摩擦因数分别提高了26.9 ~ 75%和32.9 ~ 92%。椭球面韧窝粗糙度加速了向临界雷诺数的转变，使其小于1000。通过对(Nua/Nus)/(fa/fs)的综合性能评价，在相同摩擦损失的情况下，优化凹泡管设计可获得最大约87%的传热强化。
In the present investigation, heat transfer and hydrodynamics analysis of a new enhanced heat transfer tube with ellipsoidal dimples was carried out. The dimples are disposed to form a certain specified angle between the major axis of the ellipsoid and flow direction, and the direction of the major axis of each adjacent ellipsoidal dimple in the same cross-section is alternated. Experimental tests were carried out with heating water on the shell side with a constant flow rate, and cold air in the tube side with flow rates range from 1 to 55m3/h. The temperatures and pressures for the inlet and outlet of both sides were measured. The heat transfer and pressure drop of the new dimpled tube were investigated and compared with the results of a dimpled tube with spherical dimples and a conventional smooth tube. The computed results indicated that the Nusselt number for ellipsoidal dimpled tube and spherical dimpled tube are 38.6–175.1% and 34.1–158% higher than that for the smooth tube respectively. The friction factors of dimpled tube increase by 26.9–75% and 32.9–92% for ellipsoidal and spherical dimples compared with the smooth tube respectively. It was perceived that ellipsoidal dimple roughness accelerates transition to critical Reynolds numbers down to less than 1000. By integrated performance evaluation of (Nua/Nus)/(fa/fs), a maximum of about 87% heat transfer enhancement with the same friction penalty could be achieved by optimize the dimpled tube design.
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DOI：
10.1115/2000-gt-0230
发表时间：
2000-05
期刊：
--
影响因子：
--
作者：
G. I. Mahmood;M. L. Hill;D. Nelson;P. Ligrani;H. Moon;B. Glezer
通讯作者：
G. I. Mahmood;M. L. Hill;D. Nelson;P. Ligrani;H. Moon;B. Glezer
DOI：
--
发表时间：
1976
期刊：
--
影响因子：
--
作者：
V. Gnielinski
通讯作者：
V. Gnielinski
影响因子：
3.2
作者：
É. K. Kalinin;G. A. Dreitser;N. Paramonov;A. S. Myakochin;A. Tikhonov;S. G. Zakirov;E. Levin;L. Yanovsky
通讯作者：
É. K. Kalinin;G. A. Dreitser;N. Paramonov;A. S. Myakochin;A. Tikhonov;S. G. Zakirov;E. Levin;L. Yanovsky
DOI：
10.1243/pime_proc_1941_145_026_02
发表时间：
1941-06
期刊：
--
影响因子：
--
作者：
W. F. Cope
通讯作者：
W. F. Cope
影响因子：
--
作者：
W. J. Marner;A. Bergles;J. Chenoweth
通讯作者：
W. J. Marner;A. Bergles;J. Chenoweth