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Transient mixed convection of a backward-facing step with a periodically heated wall

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This paper presents a numerical study of transient mixed convection of a backward-facing step flow. The step and its attached lower wall are heated periodically with a non-zero mean temperature, while the upper wall is kept adiabatic. The changes of flow and thermal field with time are studied for three Prandtl numbers which are 0.03, 0.7, and 7.0, respectively. Results show that the flow field is not affected by the oscillatory wall temperature for different fluids, rather, only the thermal field of low Prandtl number is affected. The periodic nature and the time lag of the local Nusselt number distribution are observed from the fluid of low Prandtl number.

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  1. C. I. Hung &  K. H. Kuei

    Present address: Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan, Republic of China

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    1. C. I. Hung
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    2. K. H. Kuei
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    Hung, C.I., Kuei, K.H. Transient mixed convection of a backward-facing step with a periodically heated wall. Acta Mechanica 120, 233–241 (1997). https://doi.org/10.1007/BF01174327

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    • DOI: https://doi.org/10.1007/BF01174327

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