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Laminar flow heat transfer to viscous powerlaw fluids in double-sine ducts

✍ Scribed by R.M. Manglik; J. Ding

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
872 KB
Volume
40
Category
Article
ISSN
0017-9310

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✦ Synopsis

Abstraet--F~ally developed, constant property, laminar flows of viscous power-law fluids in double-sine shaped ducts are considered. The double-sine cross section represents a limiting inter-plate channel geometry in plate heat exchangers with sinusoidally corrugated plates. The non-Newtonian fluid rheology is described by the power-law or Ostwald-de Waele model, and shear thinning (n < 1) as well as shear thickening (n > 1) flows are considered. Both fluid flow and convective heat transfer problems under (T) and (HI) thermal boundary conditions are analyzed. Analytical solutions based on the Galerkin integral method are presented for a wide range of flow behavior index (0.15 ~< n ~< 2.5) and duct aspect ratio (0.25 ~< 7 ~< .4.0). The effects of fluid rheology (pseudoplasticity or dilatancy), duct geometry, and thermal boundary conditions on the velocity and temperature field, are delineated. Also, isothermal friction factor and Nusselt number results for various conditions are presented, and strategies for predictingfRe and Nu are evaluated.

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