کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
645398 | 1457139 | 2015 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A numerical study on the hydrodynamic and heat transfer characteristics of oscillating Taylor bubble in a capillary tube
ترجمه فارسی عنوان
یک مطالعه عددی بر ویژگی های انتقال هیدرودینامیکی و انتقال حرارت از نوسان تیلور حباب در یک لوله مویرگی
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
In this paper hydrodynamic and non-phase change heat transfer characteristics of Taylor-Bubble (T-B) due to pressure induced oscillations is numerically investigated. The numerical method is validated with previous results for the simulation of unidirectional Taylor-Bubble flow and with in-house experimental data for adiabatic oscillatory T-B using FC-72 as the working fluid. A parametric study involving the effect of applied frequency of oscillation and bubble length on hydro dynamic and heat transfer characteristics of oscillatory T-B is carried out. From the bubble frequency study, it is observed that the average film thickness decreases with the oscillation frequency continuously. The time averaged Nusselt Number, Nu*, is found to be inversely proportional to the average film thickness. From the bubble length study, it is concluded that Nu* increases with increasing bubble length. The ratio of Nu* to the pressure drop across the capillary reveals an increasing trend with the bubble length at 5Â Hz applied frequency while the opposite trend is observed at 50Â Hz frequency. This has a significant impact on the heat transfer characteristics of pulsating heat pipes in which the oscillation frequency of T-B is less than 10Â Hz.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 89, 5 October 2015, Pages 628-639
Journal: Applied Thermal Engineering - Volume 89, 5 October 2015, Pages 628-639
نویسندگان
Arvind Pattamatta, Axel Sielaff, Peter Stephan,