Heat-Mass Transfer and Friction Characteristics of Profiled Pins at Low Reynolds Numbers in Minichannels

Sreedharan, Sai Shrinivas; Tafti, Danesh K.; Rozati, Ali; Blackwell, Neal E.

doi:10.1080/10407780802025598

Cited by 8 publications

(4 citation statements)

References 18 publications

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“…The flow characteristics play a key role in understanding how the array is able to enhance or decrease the heat exchange, the mixing layer or the unsteady body forces (Chatterjee et al 2009, Fornarelli and Vittori 2009, Lo and Su 2012, Lu et al 2012. Sreedharan et al 2008 experiments, on different pin geometries, highlight that the heat transfer enhancement is related to the pin wake characteristics. In particular the vorticity dynamics and the vortex street formation around multiple bodies is strictly related to the wake interaction (Hanson and Ziada 2011, Rinaldi and Padoussis 2012, Ziada and Oengren 1992.…”

Section: Introductionmentioning

confidence: 99%

Flow Patterns and Heat Transfer Around Six in-Line Circular Cylinders at Low Reynolds Number

Fornarelli¹,

Oresta²,

Lippolis³

2015

JPHMT

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Section: Introductionmentioning

confidence: 99%

Flow Patterns and Heat Transfer Around Six in-Line Circular Cylinders at Low Reynolds Number

Fornarelli¹,

Oresta²,

Lippolis³

2015

JPHMT

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“…Three dimensional incompressible time-dependent Navier-Stokes equations and the conservation of mass and energy equations are solved using second order finite difference formulations for the advection and diffusion terms on a hexahedral mesh. Radiation is neglected and has been shown to be negligible to heat transfer in these low temperature applications (Sreedharan et al [17]). A LES approach was used and the Smagorinsky subgrid turbulence model was implemented.…”

Section: Governing Equations and Numerical Methodsmentioning

confidence: 99%

“…Sreedharan et al [17] studied profiled pins, finding advantages in a pin with its narrowest point at half its height. Rozati et al [18] studied various pin arrangements using square, diamond and circular pin shapes.…”

Section: Introductionmentioning

confidence: 98%

Effect of Pin Tip Dual Clearance on Flow and Heat Transfer at Low Reynolds Numbers

Seibert

Blackwell

Tafti

2014

Journal of Heat Transfer

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This paper examines the augmentation of heat and mass transfer due to dual clearances on cylindrical pin fins, relative to a channel between parallel plates, in mini/microchannel reactors at low Reynolds numbers. In this work, diffusion limitations to heat and mass transfer in smooth-walled minilmicrochannel reactors were minimized by the implementation of microcylinder pin fins with dual clearances that, (1) promote the production of instabilities in the wakes that enhance mixing and (2) reduce the viscosity dominated regions at pin-wall interfaces. A smooth catalyst coating is assumed on all exposed surfaces of the microchannel interior walls and pin fins. Due to the analogy of heat and mass transfer, augmentation of the Nusselt number is equivalent to the augmentation of the Sherwood number. Heat transfer augmentation is investigated in air (Pr = 0.705) at dual clearances ranging from 0 to 0.4 of the channel height and Reynolds numbers from 10 to 600. The pin fins and the clearance augmented the heat transfer coefficient by a factor of 4.0. The combination of the augmentation of the heat transfer coefficient and the increase in the surface area, by the clearances, results in an increase in the conductance over a plane channel, by a factor of 7.1. The results are extendable to overcoming laminar diffusion with laminar periodic wakes of fuel vapors such as methanol vapor in air where Scfuei ~ Prair-For turbulent wakes impinging upon downstream pins, the results can be extended to fuel vapors with (Scfi,^,),,.rh~(Prahhurb-A large eddy simulation (LES) approach was used in this study.

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“…Their computations showed that the cooling and heating effects of the microstructure temperature on flow properties are enhanced with decreasing Knudsen number and higher microstructure temperature. Other studies have considered flow with heated porous blocks and baffles [21,26,27], heat and mass transfer characteristics of pins at low Reynolds numbers in minichannels [22], uneven placement of finitesize heat sources in a channel [23], and heat sinks with ribbed and dimpled surfaces in laminar flow [24]. However, all of the aforementioned studies, only considered the effect of transverse protrusions on the channel flow and heat transfer and in most cases the protrustions or the ribs were conductive.…”

Section: Nusselt Number Distribution For Channel R-i Flow 311mentioning

confidence: 97%

Effect of Net Geometry on the Nusselt Number Distribution for Channel Flow

Venkatraman

Shimpalee

Zee

2009

Numerical Heat Transfer, Part A: Applications

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For channel flow between two parallel plates, obstacles may take the form of ordered asymmetrical porous nets. The dimensions of this net will affect the resulting variations in the laminar velocities and the local heat and mass transfer coefficients. This article presents a numerical study of the effect of an inert insulating net and its geometry on the heat transfer characteristics in such a system. The governing equations for momentum, continuity, and energy equation were solved in a three-dimensional domain using a commercial CFD software for fully developed flow with constant temperature boundary conditions. The local Nusselt number was calculated from the resulting temperature distribution. The effects of location, spacing, and number of the longitudinal and transverse ribs of the net on the distributions and on the mean Nusselt number of the two plates are analyzed. Enhancement factors of the mean Nusselt number were found to increase between 13 and 330% as the number of transverse ribs increased from four to 29 for typical nets with a 0.27 mm thickness. However, for the same nets, the enhancement factors of the mean Nusselt number were found to decrease between 16 and 50% as the number of longitudinal ribs increased from four to 14.

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Heat-Mass Transfer and Friction Characteristics of Profiled Pins at Low Reynolds Numbers in Minichannels

Cited by 8 publications

References 18 publications

Flow Patterns and Heat Transfer Around Six in-Line Circular Cylinders at Low Reynolds Number

Flow Patterns and Heat Transfer Around Six in-Line Circular Cylinders at Low Reynolds Number

Effect of Pin Tip Dual Clearance on Flow and Heat Transfer at Low Reynolds Numbers

Effect of Net Geometry on the Nusselt Number Distribution for Channel Flow

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