Structure of grid turbulence through a heated screen

Toshihisa Ueda; Osamu Hisai; I. Nyoman Gede Wardana; Masahiko Mizomoto

doi:10.1299/jsmeb1988.35.2_266

Structure of grid turbulence through a heated screen

Toshihisa Ueda, Osamu Hisai, I. Nyoman Gede Wardana, Masahiko Mizomoto

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

Measurements of mean values and turbulent intensities of velocity and temperature fluctuations of grid turbulence have been made in a developing region just after an electrically heated screen. The air velocity is set as 1 m/s. The electric current to the screen is adjusted to be the downstream temperature (T_a) 32°C, 100°C or 150°C. Hot wire anemometry with compensation for temperature variation is used to measure velocity with temperature variation. In a developing region, both velocity and temperature distributions become non-uniform at a point just downstream of the heated screen. The distributions recover gradually to the uniform condition in a downstream region. Turbulent energy dissipates with the distance from the heated screen. The dissipation rate is decreased with increasing air temperature.

Original language	English
Pages (from-to)	266-272
Number of pages	7
Journal	JSME International Journal, Series 2: Fluids Engineering, Heat Transfer, Power, Combustion, Thermophysical Properties
Volume	35
Issue number	2
DOIs	https://doi.org/10.1299/jsmeb1988.35.2_266
Publication status	Published - 1992 Jan 1

ASJC Scopus subject areas

Mechanical Engineering
Physical and Theoretical Chemistry
Fluid Flow and Transfer Processes

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AU - Ueda, Toshihisa

AU - Hisai, Osamu

AU - Wardana, I. Nyoman Gede

AU - Mizomoto, Masahiko

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N2 - Measurements of mean values and turbulent intensities of velocity and temperature fluctuations of grid turbulence have been made in a developing region just after an electrically heated screen. The air velocity is set as 1 m/s. The electric current to the screen is adjusted to be the downstream temperature (Ta) 32°C, 100°C or 150°C. Hot wire anemometry with compensation for temperature variation is used to measure velocity with temperature variation. In a developing region, both velocity and temperature distributions become non-uniform at a point just downstream of the heated screen. The distributions recover gradually to the uniform condition in a downstream region. Turbulent energy dissipates with the distance from the heated screen. The dissipation rate is decreased with increasing air temperature.

AB - Measurements of mean values and turbulent intensities of velocity and temperature fluctuations of grid turbulence have been made in a developing region just after an electrically heated screen. The air velocity is set as 1 m/s. The electric current to the screen is adjusted to be the downstream temperature (Ta) 32°C, 100°C or 150°C. Hot wire anemometry with compensation for temperature variation is used to measure velocity with temperature variation. In a developing region, both velocity and temperature distributions become non-uniform at a point just downstream of the heated screen. The distributions recover gradually to the uniform condition in a downstream region. Turbulent energy dissipates with the distance from the heated screen. The dissipation rate is decreased with increasing air temperature.

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