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Laminar NonNewtonian Fluid Flow in Noncircular Ducts and Microchannels NonNewtonian ﬂuid ﬂow in noncircular ducts and microchannels is examined. A simple model is proposed for power Laminar flow of nonnewtonian fluids in noncircular ducts ﬂuids based on the Rabinowitsch–Mooney formulation.
By means of a new characteristic length scale, the square root of the crosssectional area. NonNewtonian fluid flow in noncircular ducts and microchannels is examined. A simple model is proposed for power law fluids based on the Rabinowitsch–Mooney formulation.
By means of a new characteristic length scale, the square root of the crosssectional area, it is shown that dimensionless wall shear stress can be made a weak function of Cited by: Viscous Dissipation Effect on Pressure Gradient for Laminar Flow of a NonNewtonian Liquid Through a Duct of Subfreezing Wall Temperature J.
Heat Transfer (November,) An Equation for Laminar Flow Heat Transfer for Constant Heat Flux Boundary Condition in Ducts of Cited by: 1. All available data on flow of non‐Newtonians in pipes have been correlated on the conventional friction factor — Reynolds number plot for Newtonian fluids.
This correlation, theoretically rigorous in the laminar flow region, was tested with data on 16 different non‐Newtonian materials covering the × 10 9 range of Reynolds numbers Cited by: K. Kanaka Raju, Rathna Devanathan, Heat transfer to nonNewtonian fluids in laminar flow through concentric annuli with or without suction, Rheologica Acta, /BF, 10, Cited by: Seyed Shahab Mozafarie, Kourosh Javaherdeh, Numerical design and heat transfer analysis of a nonNewtonian fluid flow for annulus with helical fins, Engineering Science and Technology, an International Journal, /, ().
The fully developed laminar flow of NonNewtonian fluids in ducts has broad application in engineering. The powerlaw viscosity model is utilized most often in the engineering literature, but it is deficient for many fluids as it does not admit limiting Newtonian viscosities at low and high shear rates.
Fig. Forced convection heat transfer in a circular 12 tube with Laminar flow of nonnewtonian fluids in noncircular ducts wall heat flux. Fig. Forced convection heat transfer in a circular 14 tube with developing flows and a uniform wall temperature.
Fig. Forced convection heat transfer in a circular 18 tube for the flow of nonNewtonian fluids. Seppo Syrjälä, Finiteelement analysis of fully developed laminar flow of powerlaw nonNewtonian fluid in a rectangular duct, International Communications in Heat and Mass Transfer, /(95), 22, 4, (), ().
Details Laminar flow of nonnewtonian fluids in noncircular ducts, with and without heat transfer. PDF
An early example is the use of the wellknown KarmanNikuradseMartinelli threelayer model developed for fully established turbulent pipe flow of a Newtonian fluid [ in which the flow region is divided into a laminar sublayer, a buffer layer, and a turbulent core region described by the following relation: u+ = 5 l n y ' Integration of this.
Heat transfer to viscous fluids in laminar flow is a process which is frequently encountered. The fluids of commercial interest may be Newtonian or nonNewtonian. A notable feature of many such viscous fluids is that their rheological properties are.
M. Kostic and J. Hartnett, Predicting turbulent fric tion factors of nonNewtonian fluids in noncircular ducts. Int. Commun. Heat Mass Trans (). Irvine, Jr. and J. Kami, NonNewtonian fluid flow and heat transfer. In Handbook of Single Phase Conrerlive Heat Transfer (Edited by S.
Kakac. The model is developed using the asymptotic results for convection from a flat plate, thermally developing flows in noncircular ducts, and fully developed flow in noncircular ducts. Through the use of a novel characteristic length scale, the square root of crosssectional area, the effect of duct shape on Nusselt number is minimized.
Description Laminar flow of nonnewtonian fluids in noncircular ducts, with and without heat transfer. FB2
This chapter discusses eccentric annular ducts for laminar flow of fluids. An eccentric instead of concentric annular duct is sometimes used as a fluidflow and heattransfer device.
There have been a number of studies on the case of laminar flows of nonNewtonian (inelastic) fluids in ducts. Hwang and Hong [1] analytically and experimentally investigated the influence of variable viscosity on the laminar heat transfer in a square duct for the constant wall temperature condition with ethylene glycol.
In nonideal fluid dynamics, the Hagen–Poiseuille equation, also known as the Hagen–Poiseuille law, Poiseuille law or Poiseuille equation, is a physical law that gives the pressure drop in an incompressible and Newtonian fluid in laminar flow flowing through a long cylindrical pipe of constant cross section.
It can be successfully applied to air flow in lung alveoli, or the flow through a. Heat transfer with nonNewtonian fluids is a vast topic given the wide range of fluids and flows of interest, and it cannot be covered in its vastness in this chapter. Internal flows are quite relevant in the scope of nonNewtonian fluid flows and heat transfer, with the pipe flow playing a leading role.
For laminar flow, μ ap has the property that it is the viscosity of a Newtonian fluid having the same flow characteristic as the nonNewtonian fluid when subjected to the same value of wall shear stress. In particular, this corresponds to the same volumetric flow rate. SunNan Hong and John C.
Matthews, Heat transfer to nonnewtonian fluids in laminar flow through concentric annuli, International Journal of Heat and Mass Transfer, 12, 12, (), (). Crossref C. Tiu, W. Kozicki and T.
Phung, Geometric parameters for some flow channels, The Canadian Journal of Chemical Engineering, 46, 6, ( The Reynolds number (Re) helps predict flow patterns in different fluid flow low Reynolds numbers, flows tend to be dominated by laminar (sheetlike) flow, while at high Reynolds numbers flows tend to be turbulence results from differences in the fluid's speed and direction, which may sometimes intersect or even move counter to the overall direction of the flow.
A review of NonNewtonian fluid flow and heat transfer in porous media was presented by Shenoy (), revealing that most concerned studies were restricted to Darcian flow.
Velocity profiles of viscoelastic fluids at the inlet of an annulus. AIChE Journal26 (1), DOI: /aic Essam Salem, Mohamed H. Embaby. Theoretical and experimental investigations of nonNewtonian fluid flow through noncircular pipes.
The results reported herein provide fundamental knowledge of the flow and heat transfer behavior for the flow of nonNewtonian fluids over a circular cylinder; these results further show that the.
Main Laminar Flow Forced Convection in Ducts. A Source Book for Compact Heat Exchanger Analytical Data A Source Book for Compact Heat Exchanger Analytical Data R.
Shah, A. London, Thomas F. Irvine and James P. Hartnett (Auth.).
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Adegun and Oladosu () studied the heat transfer and fluid flow in an elliptic duct using scale analysis. Bello Ochende and Adegun () also looked into fluid flow and heat transfer in tilted elliptic duct using the perturbation technique.
Adegun, et al. () also studied the flow of NonNewtonian fluids in elliptic ducts. This study addresses heat transfer performance of various configurations of coiled noncircular tubes, e.g., inplane spiral ducts, helical spiral ducts, and conical spiral ducts.
The laminar flow of a Newtonian fluid in helical coils made of square cross section tubes is simulated using the computational fluid dynamic approach. The effects of tube Reynolds number, fluid Prandtl number. Laminar Heat Transfer for GasLiquid Segmented Flows in Circular and NonCircular Ducts With Constant Wall Temperature ASME Paper No.
ICNMM /ICNMM Fully developed flow of an incompressible Newtonian fluid through a duct in which the orientation of the cross section is twisted about an axis parallel to an imposed pressure gradient is analyzed here with the aid of the penalty/Galerkin/finite element method.
When the axis of twist is located within the duct, flow approaches limits at low and high torsion, the spatial frequency τ by which. In this paper, we considered the laminar fully developed flow, of a Newtonian fluid, in ducts of rectangular crosssection. Poisson’s partial differential equation SaintVenant solution was used, to calculate Poiseuille number values whatever is rectangles aspect ratio.
From these results, we considered limit cases of square duct and plane Poiseuille flow (infinite parallel plates). The experimental and numerical analysis of combined forced and free convection heat transfer of a nonNewtonian fluid in a horizontal annular duct is presented.
The flow is laminar and Prandtl and. Heattransfer phenomena in laminar flow of nonlinear fluids has not been the subject of many investigations with the exception of round pipes, and the case of inelastic shearthinning fluids in tubes of rectangular crosssection, in spite of the widespread use of some specific contours in industry such as flattened elliptical tubes.for nonNewtonian power law ﬂuids.
For laminar ﬂow, it is well Heat Transfer in NonCircular Ducts and Channels: Part IHydrodynamic Prob“Laminar NonNewtonian Fluid Flow in.Request PDF  Heat transfer characteristics of nonNewtonian fluids in pipes  In many chemical and processing applications, fluids need to be heated or cooled and a wide range of equipment may be.

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