ライブラリ登録: Guest
Begell Digital Portal Begellデジタルライブラリー 電子書籍 ジャーナル 参考文献と会報 リサーチ集
Computational Thermal Sciences: An International Journal
ESCI SJR: 0.244 SNIP: 0.434 CiteScore™: 0.7

ISSN 印刷: 1940-2503
ISSN オンライン: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2014006371
pages 79-90

HEAT TRANSFER IN A VISCOELASTIC ORIFICE FLOW AT LOW TO MODERATE REYNOLDS NUMBERS

Takahiro Tsukahara
Department of Mechanical Engineering, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba, 278-8510, Japan
T. Kawase
Department of Mechanical Engineering, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba278-8510, Japan
Yasuo Kawaguchi
Department of Mechanical Engineering, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 278-8510, Japan

要約

Direct numerical simulations of heat transfer in channel flows of a viscoelastic fluid with an immersed periodic rectangular orifice were carried out to investigate the statistics of the velocity and thermal fields. The friction Weissenberg number of the viscoelastic fluid was set at 20 and the Prandtl number was given as either 1.0 or 2.0. In the present flow configuration, the reduction rates of the drag factor and the Nusselt number were ranged in the percent drag reduction DR% = −90%−20% and the percent heat-transfer reduction HTR% = 0%−50%, respectively. The variations observed in the Reynolds-number dependencies of DR%, HTR%, and the separated flow behind the orifice were analyzed. Consequently, the viscoelasticity was found to affect the orifice flow and its heat transfer most significantly in the transitional regime, since it suppressed the turbulent transition and/or the Kelvin-Helmholtz instability of the separated shear layer emanating from the orifice edge.


Articles with similar content:

DEVELOPMENT OF A TURBULENT SPOT INTO A STRIPE PATTERN IN PLANE POISEUILLE FLOW
TSFP DIGITAL LIBRARY ONLINE, Vol.7, 2011, issue
Hiroshi Aida, Yasuo Kawaguchi, Takahiro Tsukahara
LARGE EDDY SIMULATIONS OF TURBULENT COUETTE-POISEUILLE AND COUETTE FLOWS INSIDE A SQUARE DUCT
TSFP DIGITAL LIBRARY ONLINE, Vol.8, 2013, issue
Chao-An Lin, Wei Lo, Hsin-Wei Hsu, Jian-Bin Hsu
A ROLE OF ELASTIC ENERGY IN TURBULENT DRAG REDUCTION BY POLYMER ADDITIVES
TSFP DIGITAL LIBRARY ONLINE, Vol.2, 2001, issue
Jung Yul Yoo, Taegee Min , Haecheon Choi, Daniel D. Joseph
Experimental analysis of turbulent structure of viscoelastic fluid flow in downstream of two-dimensional orifice
ICHMT DIGITAL LIBRARY ONLINE, Vol.0, 2012, issue
Yasuo Kawaguchi, Shoko Kawada, D. Tsurumi, Takahiro Tsukahara, T. Kawase
EXPERIMENTAL INVESTIGATION OF FREE AND IMPINGING SWIRLING TURBULENT JETS WITH DIFFERENT INFLOW CONDITIONS
TSFP DIGITAL LIBRARY ONLINE, Vol.5, 2007, issue
Sergey Alekseenko, Arthur V. Bilsky, Dmitriy M. Markovich, Vladimir M. Dulin