Please explain why In Most of the papers of Tangent hyperbolic fluid the results are for Pr=0.7. Is this value of Pr physically realistic for the study of MHD flow? Is fluid with Pr=07 electrically conducting? Give example of such fluid.
Interesting discussion. Firstly, Pr = 0.7 is for a less viscous fluid like air. Meanwhile, for water Pr ranges between 6 and 7.
Secondly, tangent hyperbolic fluid is similar to Williamson fluid in all ramifications. However, both fluids posses higher level of viscosity; thus thermal diffusivity through them is very small in magnitude. In conclusion, Pr >> 7 for tangent hyperbolic fluids.
This is not true.
Some authors take less Pr values to get convergent solutions
it suffices to return to the definition of the Term of Pr. with a numerical application and thereafter you can find the value close to Pr.
Watch out for a comprehensive textbook on the significance of Prandtl number from CRC Press, Taylor and Francis...
Some authors taken less Pr values due to large number of parameter effects and also to get convergent solutions..
Ref A (2022) Ratio of Momentum Diffusivity to Thermal Diffusivity: Introduction, Meta-analysis, and Scrutinization. Chapman and Hall/CRC. New York. ISBN-13: 978-1032108520, ISBN-10: 1032108525, ISBN9781003217374
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