Calculation of impinging-jet heat transfer with the low-Reynolds-number q-ζ turbulence model

✍ Scribed by M.M. Gibson; R.D. Harper

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 625 KB
• Volume: 18
• Category: Article
• ISSN: 0142-727X
• DOI: 10.1016/s0142-727x(96)00135-x

✦ Synopsis

A two-equation model of turbulent heat transfer has been devised along the lines of the successful q-( model of the turbulent velocity field. The new variables are the square root of the temperature variance and its dissipation rate. These variables are attractive for eddy-diffusivity calculations, because their variation with distance y from the wall is linear in y when y --) 0. This feature in the q-( model for the eddy-viscosity leads to economical computations of good accuracy. The new heat transfer model has been calibrated with data from channel and boundary-layer flows and is applied here to the computation of heat transfer in the stagnation region of an impinging jet. The results compare very favourably with those based upon the assumption of a constant turbulent Prandtl number. This quantity is obtained as an output from the calculations instead of being an input to them.