The polymer effect on turbulent Rayleigh-Benard convection based on PIV experiments

被引：16

作者：

Cai, Weihua ^{[1
]}

Wei, Tongzhou ^{[1
]}

Tang, Xiaojing ^{[1
]}

Liu, Yao ^{[1
]}

Li, Biao ^{[1
]}

Li, Fengchen ^{[2
]}

机构：

[1] Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China

[2] Sun Yat Sen Univ, Sino French Inst Nucl Engn & Technol, Zhuhai 519082, Peoples R China

来源：

EXPERIMENTAL THERMAL AND FLUID SCIENCE | 2019年 / 103卷

基金：

中国国家自然科学基金;

关键词：

Rayleigh-Benard convection; Polymer; Large-scale circulation; Heat transfer; NATURAL-CONVECTION; HEAT-TRANSFER; NANOFLUIDS; CAVITY; TEMPERATURE; SEDIMENTATION; LAYER; FLOW;

D O I：

10.1016/j.expthermflusci.2019.01.011

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

this paper, we present an experimental study to investigate the polymer effect on the characteristics of heat transport and large-scale circulation (LSC) in turbulent Rayleigh-Benard convection (RBC). Polyethylene oxide (PEO) solution with no shear-thinning behavior was used. The velocity field was obtained by particle image velocimetry and the temperature was measured by thermistors. The results show that Nusselt number decreases with the increasing concentration c in polymer solution case and levels off for c > 200 ppm. For PEO solution cases, the scaling exponents between Nusselt number and Rayleigh number become a little smaller. The maximum value of velocity field shifts to the bulk region in polymer solution cases. Besides, the LSC path length decreases with the increase of PEO solution concentration so as to make the size of LSC become smaller. Therefore, it induces the reduction of heat transport in RBC with polymers.

引用

页码：214 / 221

页数：8

共 34 条

[1] Effect of a Polymer Additive on Heat Transport in Turbulent Rayleigh-Benard Convection [J].

Ahlers, Guenter ;

Nikolaenko, Alexei .

PHYSICAL REVIEW LETTERS, 2010, 104 (03)

[2] Heat transfer and large scale dynamics in turbulent Rayleigh-Benard convection [J].

Ahlers, Guenter ;

Grossmann, Siegfried ;

Lohse, Detlef .

REVIEWS OF MODERN PHYSICS, 2009, 81 (02) :503-537

[3]

[Anonymous], 1948, P 1 INT C RHEOL

[4] TEMPERATURE AND VELOCITY BOUNDARY-LAYERS IN TURBULENT CONVECTION [J].

BELMONTE, A ;

TILGNER, A ;

LIBCHABER, A .

PHYSICAL REVIEW E, 1994, 50 (01) :269-279

[5] Turbulent Rayleigh-Benard convection with polymers: Understanding how heat flux is modified [J].

Benzi, Roberto ;

Ching, Emily S. C. ;

De Angelis, Elisabetta .

PHYSICAL REVIEW E, 2016, 94 (06)

[6] Heat transport modification by finitely extensible polymers in laminar boundary layer flow [J].

Benzi, Roberto ;

Ching, Emily S. C. ;

Yu, Wilson C. K. ;

Wang, Yiqu .

JOURNAL OF FLUID MECHANICS, 2016, 788 :337-357

[7] Heat transport by laminar boundary layer flow with polymers [J].

Benzi, Roberto ;

Ching, Emily S. C. ;

Chu, Vivien W. S. .

JOURNAL OF FLUID MECHANICS, 2012, 696 :330-344

[8] Effect of Polymer Additives on Heat Transport in Turbulent Thermal Convection [J].

Benzi, Roberto ;

Ching, Emily S. C. ;

De Angelis, Elisabetta .

PHYSICAL REVIEW LETTERS, 2010, 104 (02)

[9]

CASTRO W, 1967, APPL SCI RES, V18, P81

[10] Effect of polymer additives on heat transport and large-scale circulation in turbulent Rayleigh-Benard convection [J].

Cheng, Jian-Ping ;

Zhang, Hong-Na ;

Cai, Wei-Hua ;

Li, Si-Ning ;

Li, Feng-Chen .

PHYSICAL REVIEW E, 2017, 96 (01)

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