|Title:||Heat transfer of an impinging turbulent jet on a heated rectangular plate with vapourisation|
|Subject:||Jets -- Fluid dynamics|
Heat -- Transmission
Vaporization, Heats of
Hong Kong Polytechnic University -- Dissertations
Department of Mechanical Engineering
|Pages:||x, 97 leaves : ill. ; 30 cm|
|Abstract:||An investigation and analytical predication of the hydrodynamics and heat transfer by directing an unconfined axisymmetric turbulent vapourising air/diesel fuel jet impinging normally on a heated flat surface have been performed. The 2-equation k-庰 turbulence model is adopted. The general transport equations of the jet flow are discretised and solved by finite difference method using SIMPLE algorithm with power-law scheme and under-relaxation. Non-uniform grid size is used. The parameters examined in this work included the jet Reynolds number ReJ, wall temperature TS, nozzle-to-plate distance x/DJ and diesolin spray mass flow rate. Condition of heated plate surface temperature ranged from 150C to 205C. The flowing liquid film thus formed partially covered the heated plate surface. Local dryout due to the evapouration of liquid film occur for sufficiently high jet Reynolds number. The predicted maximum heat transfer coefficient and hence the local Nusselt number Nur occur near the stagnation region. The model has difficulties to accurately predict the liquid film mass flow and heat transfer at the stagnation region, and it affects the accuracy of subsequent calculations of the flowing liquid film properties. Further refinement of the model and boundary conditions of the spray mass flow model in the stagnation region is needed.|
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