Casson fluid flow in a microchannel containing a flow disturbing rib

Passos, A.D.; Chatzieleftheriou, Vasileios-Alexandros; Mouza, A.A.; Paras, S.V.

doi:10.1016/j.ces.2016.04.006

Cited by 20 publications

(9 citation statements)

References 23 publications

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“…Further, we mention the recently published paper by Rahman and Pop (2016), where the effects of second-order slip and viscous dissipation on the boundary layer flow and heat transfer characteristics of a Casson fluid have been investigated. Finally, we mention here also the paper by Passos et al (2016) who have investigated numerically the Casson flow in a rectangular microchannel with an obstacle. It has been ascertained that for Re > 50, the reattachment length decreases up to 35 per cent for the Casson fluid in comparison with Newtonian fluid.…”

Section: Introductionmentioning

confidence: 98%

Free convection in a square cavity filled with a Casson fluid under the effects of thermal radiation and viscous dissipation

Pop

Sheremet

2017

HFF

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Purpose The main purpose of this numerical work is to study free convection of Casson fluid in a square differentially heated cavity taking into account the effects of thermal radiation and viscous dissipation. Design/methodology/approach The cavity is heated from the left vertical wall and cooled from the right vertical wall while horizontal walls are insulated. The governing partial differential equations invoking Rosseland approximation for thermal radiation with corresponding boundary conditions have been solved by finite difference method of the second-order accuracy using dimensionless variables stream function, vorticity and temperature. The governing parameters are Rayleigh number (Ra = 105), Prandtl number (Pr = 0.1, 0.7, 7.0), Casson parameter (γ = 0.1-5.0), radiation parameter (Rd = 0-10), Eckert number (Ec = 0-1.0). Findings It is found that an increase in Casson parameter leads to the heat transfer enhancement and fluid flow intensification. While a growth of Eckert number illustrates the heat transfer suppression. Originality/value The originality of this work is to analyze for the first-time natural convective fluid flow and heat transfer of a Casson fluid within a differentially heated square cavity under the effects of thermal radiation and viscous dissipation. The results would benefit scientists and engineers to become familiar with the flow behavior of such non-Newtonian fluids, and the way to predict the properties of this flow for possibility of using this specific fluid in various engineering and industrial processes, such as chyme movement in intestine, blood flows, lubrication processes with grease and heavy oils, glass blowing, electronic chips, food stuff, slurries, etc.

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Section: Introductionmentioning

confidence: 98%

Free convection in a square cavity filled with a Casson fluid under the effects of thermal radiation and viscous dissipation

Pop

Sheremet

2017

HFF

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“…Equipping rectangular channels with vortex generators (VGs) has been demonstrated to be a promising method to passively augment the heat transfer performance [10][11][12][13][14]. Vortex generators with various shapes such as wing [15], winglet [16], rib [17,18], pin fin [19] and surface protrusions [20][21][22][23] have been utilised for heat transfer enhancement applications. The pressure difference between two sides of VGs leads to flow separation from the side edges, which generates longitudinal, transverse and horseshoe vortices [24].…”

Section: Introductionmentioning

confidence: 99%

Laminar convective heat transfer of shear-thinning liquids in rectangular channels with longitudinal vortex generators

Ebrahimi

Naranjani

Milani

et al. 2017

Chemical Engineering Science

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Heat and fluid flow in a rectangular channel heat sink equipped with longitudinal vortex generators have been numerically investigated in the range of Reynolds numbers between 25 and 200. Aqueous solutions of carboxymethyl cellulose (CMC) with different concentrations (200-2000 ppm), which are shear-thinning non-Newtonian liquids, have been utilised as working fluid. Three-dimensional simulations have been performed on a plain channel and a channel with five pairs of vortex generators. The channels have a hydraulic diameter of 8 mm and are heated by constant wall temperature. The vortex generators have been mounted at different angles of attack and locations inside the channel. The shear-thinning liquid flow in rectangular channels with longitudinal vortex generators are described and the mechanisms of heat transfer enhancement are discussed. The results demonstrate a heat transfer enhancement of 39-188% using CMC aqueous solutions in rectangular channels with LVGs with respect to a Newtonian liquid flow (i.e. water). Additionally, it is shown that equipping rectangular Page 2 of 40 channels with LVGs results in an enhancement of 24-135% in heat transfer performance visà-vis plain channel. However, this heat transfer enhancement is associated with larger pressure losses. For the range of parameters studied in this paper, increasing the CMC concentration, the angle of attack of vortex generators and their lateral distances leads to an increase in heat transfer performance. Additionally, heat transfer performance of rectangular channels with longitudinal vortex generators enhances with increasing the Reynolds number in the laminar flow regime.

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“…Casson fluid flow in a rectangular μ-channel with a flow-disturbing rib was numerically studied by Passos et al. 33 Recently, Makinde et al. 34 and Shashikumar et al.…”

Section: Introductionmentioning

confidence: 99%

“…The Soret and Dufour effects on the MHD flow of Casson fluid over a stretching sheet are examined by Hayat et al 31 Ng 32 obtained analytical solutions for the steady electroosmotic flow of Casson fluid, through a parallel-plate microchannel. Casson fluid flow in a rectangular -channel with a flow-disturbing rib was numerically studied by Passos et al 33 Recently, Makinde et al 34 and Shashikumar et al 35,36 reported the combined effects of magnetic field, porous media permeability, wall suction/injection, and thermal radiation on heat transfer and entropy generation of an electrically conducting Casson fluid flow over a vertical and horizontal microchannel with slip, temperature jump, and convective boundary conditions. On the other hand, hydromagnetic flows and heat transfer in porous media have been considered extensively in recent years due to their occurrence in several engineering processes such as compact heat exchangers, metallurgy, casting, filtration of liquid metals, cooling of nuclear reactors, and fusion control.…”

Section: Introductionmentioning

confidence: 99%

Entropy generation and heat transport analysis of Casson fluid flow with viscous and Joule heating in an inclined porous microchannel

Gireesha

Srinivasa

Shashikumar

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part E:

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The combined effects of the magnetic field, suction/injection, and convective boundary condition on heat transfer and entropy generation in an electrically conducting Casson fluid flow through an inclined porous microchannel are scrutinized. The temperature-dependent heat source is also accounted. Numerical simulation for the modelled problem is presented via Runge–Kutta–Felhberg-based shooting technique. Special attention is given to analyze the impact of involved parameters on the profiles of velocity [Formula: see text], temperature [Formula: see text], entropy generation [Formula: see text], and Bejan number [Formula: see text]. It is established that entropy generation rate decreases at the walls with an increase in Hartmann number [Formula: see text], while it increases at the center region of the microchannel.

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Casson fluid flow in a microchannel containing a flow disturbing rib

Cited by 20 publications

References 23 publications

Free convection in a square cavity filled with a Casson fluid under the effects of thermal radiation and viscous dissipation

Free convection in a square cavity filled with a Casson fluid under the effects of thermal radiation and viscous dissipation

Laminar convective heat transfer of shear-thinning liquids in rectangular channels with longitudinal vortex generators

Entropy generation and heat transport analysis of Casson fluid flow with viscous and Joule heating in an inclined porous microchannel

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