TY - GEN
T1 - THE EVOLUTION OF PLANAR AND AXISYMMETRIC YIELD/POWER-LAW JETS
AU - Jafri, Ijaz H.
AU - Vradis, George C.
N1 - Publisher Copyright:
© 1996 American Society of Mechanical Engineers (ASME). All rights reserved.
PY - 1996
Y1 - 1996
N2 - The evolution of a steady, incompressible, nonisothermal submerged jet of a non-Newtonian yield/power-law fluid jet is studied using a numerical solution of the governing boundary layer equations. Emphasis is placed in studying the effects of the governing non-dimensional flow parameters i.e. the yield number, power-law index, and Prandtl number. Both yield-pseudoplastic and yield-dilatant fluids are studied for planar and axisymmetric geometries. Decay histories of the jet's center-line velocity and temperature as well as the spread of the half-width of the jets are obtained. These results show that the jet evolution, as described by the decay of the centerline velocity and evolution of the jet's half-width, becomes independent of the power-law index at higher yield numbers. The jet expansion boundary is concave to the jetaxis for all values of the power-law index for fluids that exhibit a yield stress. Moreover, the results depict the near independence of the decay of the centerline temperature from the power-law index. Also, it is established that for fluids exhibiting yield, mixing is much more rapid as compared to that of yield-stress free fluids.
AB - The evolution of a steady, incompressible, nonisothermal submerged jet of a non-Newtonian yield/power-law fluid jet is studied using a numerical solution of the governing boundary layer equations. Emphasis is placed in studying the effects of the governing non-dimensional flow parameters i.e. the yield number, power-law index, and Prandtl number. Both yield-pseudoplastic and yield-dilatant fluids are studied for planar and axisymmetric geometries. Decay histories of the jet's center-line velocity and temperature as well as the spread of the half-width of the jets are obtained. These results show that the jet evolution, as described by the decay of the centerline velocity and evolution of the jet's half-width, becomes independent of the power-law index at higher yield numbers. The jet expansion boundary is concave to the jetaxis for all values of the power-law index for fluids that exhibit a yield stress. Moreover, the results depict the near independence of the decay of the centerline temperature from the power-law index. Also, it is established that for fluids exhibiting yield, mixing is much more rapid as compared to that of yield-stress free fluids.
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U2 - 10.1115/IMECE1996-0225
DO - 10.1115/IMECE1996-0225
M3 - Conference contribution
AN - SCOPUS:85169296962
T3 - ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
SP - 27
EP - 36
BT - Rheology and Fluid Mechanics of Nonlinear Materials
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 1996 International Mechanical Engineering Congress and Exposition, IMECE 1996
Y2 - 17 November 1996 through 22 November 1996
ER -