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Title: Heat transport measurements in turbulent rotating Rayleigh-Benard convection

Abstract

We present experimental heat transport measurements of turbulent Rayleigh-Benard convection with rotation about a vertical axis. The fluid, water with Prandtl number ({sigma}) about 6, was confined in a cell which had a square cross section of 7.3 cm x 7.3 cm and a height of 9.4 cm. Heat transport was measured for Rayleigh numbers 2 x 10{sup 5} < Ra < 5 x 10{sup 8} and Taylor numbers 0 < Ta < 5 x 10{sup 9}. We show the variation of normalized heat transport, the Nusselt number, at fixed dimensional rotation rate {Omega}{sub D}, at fixed Ra varying Ta, at fixed Ta varying Ra, and at fixed Rossby number Ro. The scaling of heat transport in the range 10{sup 7} to about 10{sup 9} is roughly 0.29 with a Ro dependent coefficient or equivalently is also well fit by a combination of power laws of the form a Ra{sup 1/5} + b Ra{sup 1/3} . The range of Ra is not sufficient to differentiate single power law or combined power law scaling. The overall impact of rotation on heat transport in turbulent convection is assessed.

Authors:
 [1];  [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
960921
Report Number(s):
LA-UR-08-06538; LA-UR-08-6538
Journal ID: ISSN 1539-3755; TRN: US201008%%826
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Journal Article
Journal Name:
Physical Review E
Additional Journal Information:
Journal Name: Physical Review E; Journal ID: ISSN 1539-3755
Country of Publication:
United States
Language:
English
Subject:
36; CONVECTION; CROSS SECTIONS; HEAT TRANSFER; HEIGHT; LAWS; NUSSELT NUMBER; POWER; PRANDTL NUMBER; RANGE; RAYLEIGH NUMBER; ROTATION; SCALING; VARIATIONS; WATER

Citation Formats

Ecke, Robert E, and Liu, Yuanming. Heat transport measurements in turbulent rotating Rayleigh-Benard convection. United States: N. p., 2008. Web.
Ecke, Robert E, & Liu, Yuanming. Heat transport measurements in turbulent rotating Rayleigh-Benard convection. United States.
Ecke, Robert E, and Liu, Yuanming. Tue . "Heat transport measurements in turbulent rotating Rayleigh-Benard convection". United States. https://www.osti.gov/servlets/purl/960921.
@article{osti_960921,
title = {Heat transport measurements in turbulent rotating Rayleigh-Benard convection},
author = {Ecke, Robert E and Liu, Yuanming},
abstractNote = {We present experimental heat transport measurements of turbulent Rayleigh-Benard convection with rotation about a vertical axis. The fluid, water with Prandtl number ({sigma}) about 6, was confined in a cell which had a square cross section of 7.3 cm x 7.3 cm and a height of 9.4 cm. Heat transport was measured for Rayleigh numbers 2 x 10{sup 5} < Ra < 5 x 10{sup 8} and Taylor numbers 0 < Ta < 5 x 10{sup 9}. We show the variation of normalized heat transport, the Nusselt number, at fixed dimensional rotation rate {Omega}{sub D}, at fixed Ra varying Ta, at fixed Ta varying Ra, and at fixed Rossby number Ro. The scaling of heat transport in the range 10{sup 7} to about 10{sup 9} is roughly 0.29 with a Ro dependent coefficient or equivalently is also well fit by a combination of power laws of the form a Ra{sup 1/5} + b Ra{sup 1/3} . The range of Ra is not sufficient to differentiate single power law or combined power law scaling. The overall impact of rotation on heat transport in turbulent convection is assessed.},
doi = {},
journal = {Physical Review E},
issn = {1539-3755},
number = ,
volume = ,
place = {United States},
year = {2008},
month = {1}
}