Novel turbulence control strategy for simultaneously achieving friction drag reduction and heat transfer augmentation

Koji Fukagata; Kaoru Iwamoto; Nobuhide Kasagi

Novel turbulence control strategy for simultaneously achieving friction drag reduction and heat transfer augmentation

Koji Fukagata, Kaoru Iwamoto, Nobuhide Kasagi

Research output: Contribution to conference › Paper › peer-review

Abstract

An attempt is made for simultaneous, but independent control of skin friction reduction and heat transfer enhancement in a turbulent channel flow. First, a mathematical relation is derived of the contribution of turbulent heat flux to the Nusselt number. Two different thermal boundary conditions are considered: (1) isothermal condition, where two walls are kept at constant, but different temperatures; (2) isoflux condition, where both walls are heated at a given wall heat flux. By utilizing the difference between the derived relation and the similar relation for the skin friction (Fukagata et al., 2002), a strategy for the simultaneous control is proposed. The effects of the control strategy are examined by means of direct numerical simulation.

Original language	English
Pages	307-312
Number of pages	6
Publication status	Published - 2005 Dec 1
Externally published	Yes
Event	4th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 4 - Williamsburg, VA, United States Duration: 2005 Jun 27 → 2005 Jun 29

Other

Other	4th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 4
Country/Territory	United States
City	Williamsburg, VA
Period	05/6/27 → 05/6/29

ASJC Scopus subject areas

Fluid Flow and Transfer Processes

Cite this

Novel turbulence control strategy for simultaneously achieving friction drag reduction and heat transfer augmentation. / Fukagata, Koji; Iwamoto, Kaoru; Kasagi, Nobuhide.
2005. 307-312 Paper presented at 4th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 4, Williamsburg, VA, United States.

Research output: Contribution to conference › Paper › peer-review

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AB - An attempt is made for simultaneous, but independent control of skin friction reduction and heat transfer enhancement in a turbulent channel flow. First, a mathematical relation is derived of the contribution of turbulent heat flux to the Nusselt number. Two different thermal boundary conditions are considered: (1) isothermal condition, where two walls are kept at constant, but different temperatures; (2) isoflux condition, where both walls are heated at a given wall heat flux. By utilizing the difference between the derived relation and the similar relation for the skin friction (Fukagata et al., 2002), a strategy for the simultaneous control is proposed. The effects of the control strategy are examined by means of direct numerical simulation.

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Novel turbulence control strategy for simultaneously achieving friction drag reduction and heat transfer augmentation

Abstract

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ASJC Scopus subject areas

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