Conjugate analysis of wall conduction effects on the thermal characteristics of impinging jets

A transient numerical investigation using the conjugate heat transfer (CHT) technique has been carried out to evaluate the effects of boundary heat flux on the thermal characteristics due to the turbulent air and water jet impingement process. For the water jet, the volume of fluid method is employe...

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Bibliographic Details
Published in:International journal of heat and mass transfer 2018-01, Vol.116, p.259-272
Main Authors: Nasif, G., Balachandar, R., Barron, R.M.
Format: Article
Language:English
Subjects:
Aerodynamics
Computational fluid dynamics
Conjugate heat transfer
Convection
Fluid flow
Heat conductivity
Heat flux
Heat transfer
Impingement
Jet impingement
Multiphase flow
Nusselt number
Reynolds number
Stagnation point
Temperature distribution
Thermal conductivity
Thermal resistance
Turbulence
VOF
Working fluids
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Summary:A transient numerical investigation using the conjugate heat transfer (CHT) technique has been carried out to evaluate the effects of boundary heat flux on the thermal characteristics due to the turbulent air and water jet impingement process. For the water jet, the volume of fluid method is employed to capture the interface in the multiphase flow. It is found that the wall conduction may alter the prediction of the fluid-solid interfacial thermal characteristics compared with that from a pure convection process. The degree of influence depends on the working fluid, nozzle size, metal thermal conductivity, metal thickness and boundary heat flux. The CHT approach tends to reorganize the uniform heat flux distribution at the boundary to a non-uniform heat flux distribution at the fluid-solid interface. This is mainly attributed to the conjugate effect of the solid. For a given jet Reynolds number and boundary heat flux, the CHT results reveal that the convective heat flux at the stagnation point is higher for the air jet than for the water jet. Contrary to the non-CHT predictions, the interfacial temperature distribution is uniform for metals that possess a higher thermal conductivity with the air jet and for all metals with the water jet.
ISSN:0017-9310
1879-2189
DOI:10.1016/j.ijheatmasstransfer.2017.09.034