Enhanced Heat Transfer in Corrugated-Plate Channels With Non-Newtonian Power-Law Fluid Flows

Manglik, Raj M.; Metwally, Hossam

doi:10.1615/jenhheattransf.2014011022

Cited by 3 publications

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“…The phenomenological flow behavior produced by the first three devices has been characterized by the generation of helical vortices, or counter-rotating recirculation cells superimposed over the axial flow, which lend to considerable flow mixing and a consequent thinning of boundary layers to promote enhanced heat transfer (Bishara et al, 2013;Manglik et al, 2012;Yakovlev, 2013;Yakovlev et al, 2013). A sinusoidal corrugated-surface (or wavy-surface) plate-fin core, on the other hand, compounds the swirl flow (generated by the interplay of trough-region recirculation with axial fluid movement) with an increase in the surface are provided by the fins or extended surface (Manglik and Metwally, 2013;Zhang et al, 2004). The helical fluid recirculation of all these cases, in a mechanistic essence, articulate the enhanced forced convection equivalent of cyclical change and renewal.…”

Section: Passive Techniques Active Techniquesmentioning

confidence: 99%

The Expanding Expression of Enhanced Heat and Mass Transfer, for “The Times They Are a-Changin' … …”

Manglik

2015

J Enh Heat Transf

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Time, by its inherent definition, is dynamic. In its passage, everything transforms and changes. And just as our seasons transition and unfold new vistas (with hope, from winter to spring to summer; and with patient resilience from summer to autumn to winter), so does all else transforms in the temporal path of the cycle of life. Mr. Bob Dylan † has very eloquently given expression to change in a popular ballad when he sings, ".. . As the present now, Will later be past. .. .. . For the times they are a-changin'." Thus, what was past has also to give way to the now and new. And it is in this spirit that we celebrate the spring of 2014 and the 21 st year of publication of the Journal of Enhanced Heat Transfer (vol. 21, no. 1) with a new design of its cover. It has its own lyrics for change, rendered in the images and masthead artwork, as well as the new print format. The old cover, or perhaps the original cover and its artwork has steadfastly served the Journal of Enhanced Heat Transfer (JEHT) very well ever since the publication of its first issue in the late 1993. Much has changed and transformed since. In its journey of growth, it changed publishing stewardship between three different houses, of which its current publisher, Begell House, has significantly expanded its readership and submission outreach to all corners of our globe. The journal's inception goals of making it ".. .. .. the place to publish important papers on enhanced heat transfer, and to find the pulse of industrial application" (Webb, 1994) have not just been met to a large extent, but are also reflected in the growing impact that JEHT makes on the current scientific discourse and engineering practice (

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Section: Passive Techniques Active Techniquesmentioning

confidence: 99%

The Expanding Expression of Enhanced Heat and Mass Transfer, for “The Times They Are a-Changin' … …”

Manglik

2015

J Enh Heat Transf

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Laminar Forced Convection in Viscous Shear-Thinning Liquid Flows Inside Circular Pipes: Case for a Modified Power-Law Rheology

Subedi

Rajendran

Manglik

2020

Journal of Heat Transfer

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Laminar forced convection in viscous, non-Newtonian polymeric liquids that exhibit pseudoplastic or shear-thinning behavior is characterized. The fluid rheology is characterized by a new asymptotic power-law (APL) model, which appropriately represents extensive data for apparent viscosity variation with shear rate - from the low-shear constant-viscosity plateau to shear thinning at high shear rates. This is contrasted with the traditional Ostwald-de Waele or power-law (PL) model that invariably over-extends the pseudoplasticity in the very low shear-rate region. The latter's limitations are demonstrated by computationally obtaining frictional loss and convective heat transfer results for fully developed laminar flows in a circular pipe maintained at uniform heat flux. The Fanning friction factor and Nusselt number, as would be anticipated from the rheology map of pseudoplastic fluids, are functions of flow rate with the APL model unlike the Newtonian-like constant value obtained with the PL model. Comparisons of the two sets of results highlight the extent of errors inherent in the PL rheology model, which range from 23%-68% for frictional loss and 3.8%-13.7% for heat transfer. The new APL rheology model is thus shown to be the more precise characterization of viscous shear-thinning fluids for their thermal processing applications with convective heat transfer.

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On scattering of a material over the Ostwald-de Waele fluid bed

2016

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Enhanced Heat Transfer in Corrugated-Plate Channels With Non-Newtonian Power-Law Fluid Flows

Cited by 3 publications

References 0 publications

The Expanding Expression of Enhanced Heat and Mass Transfer, for “The Times They Are a-Changin' … …”

The Expanding Expression of Enhanced Heat and Mass Transfer, for “The Times They Are a-Changin' … …”

Laminar Forced Convection in Viscous Shear-Thinning Liquid Flows Inside Circular Pipes: Case for a Modified Power-Law Rheology

On scattering of a material over the Ostwald-de Waele fluid bed

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