A thermally stratified wind tunnel for environmental flow studies

Y. Ohya, M. Tatsuno, Y. Nakamura, H. Ueda

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20 Citations (Scopus)


A wind tunnel was constructed to study the effects of thermal stratification on flow and diffusion in the atmospheric boundary layer. The wind tunnel is of a suction type and has a 1.5 m wide, 1.2 m high, 13.5 m long, rectangular test section. Designed to produce thermally stratified flows, the tunnel is equipped with two independent temperature systems, an air-flow heating unit (AHU) and a floor temperature controlling unit (FTCU). Using the AHU and FTCU, a wide range of thermal stratification can be generated with a wind speed in the range of (U =) 0.2-2.0 m s-1. Both in neutral and stably stratified flows, the tunnel can provide a uniform smooth flow with a low turbulence intensity of about 0.4% at a wind speed less than 1 ms-1. The design features and performance of the wind tunnel are described. The characteristic of thermally stratified flows created in the test section is also discussed.

Original languageEnglish
Pages (from-to)2881-2887
Number of pages7
JournalAtmospheric Environment
Issue number16
Publication statusPublished - Aug 1996

All Science Journal Classification (ASJC) codes

  • General Environmental Science
  • Atmospheric Science


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