The paper presents a comprehensive investigation of mixed convection in a differentially heated grooved channel in the presence of an adiabatic baffle supported centrally from the top wall. Both assisting and opposing flow configurations are simulated using in-house CFD code for Richardson number 0.001-1000 and Reynolds number 10-200, considering a baffle height of up to 80% of enclosure height and air as working fluid. The flow and heat transfer characteristics have been analyzed using energy flux vectors, isotherms, averaged Nusselt number, and streamlines. The results show remarkable enhancement of heat transfer in the mixed convection regime in the presence of baffle. © 2015 Taylor & Francis Group, LLC.

Pallab Sinha Mahapatra

Department of Mechanical Engineering

Computational fluid dynamics

Heat convection

heating

Mixed convection

Reynolds number

CONVECTION REGIME

ENERGY FLUXES

ENHANCEMENT OF HEAT TRANSFER

Flow and heat transfer

GROOVED CHANNEL

OPPOSING FLOW

Richardson number

Working fluid

Heat transfer

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

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IIT Madras

Mixed Convection Heat Transfer in a Grooved Channel in the Presence of a Baffle

Numerical Heat Transfer; Part A: Applications

Efficient visualization techniques are required to understand the flow physics for any numerical simulation. For convective heat transfer problems, most widely used techniques to visualize the fluid flow and heat transfer are streamlines and isotherms respectively. These methods are not sufficient to address the degrees of complexity associated with the complicated convective problems. Thus, different visualization techniques have been developed to represent the results depending on the problem. In this article, an effort has been made to collate visualization techniques in literature for convective heat transfer system like, heatlines, energy streamlines, energy flux vectors, proper orthogonal decomposition (POD), Poincare map etc. The fundamentals of different techniques are briefly discussed, applications of these techniques are shown with proper examples. The usefulness and limitations of these techniques are also discussed. Heatline is found to be the best visualization tool for two dimensional steady situations. However, in 3D and transient scenario Lagrangian approach or POD can be used. © 2017 Elsevier Ltd

International Journal of Heat and Mass Transfer

Heatlines and other visualization techniques for confined heat transfer systems

In the present work, heat transfer and entropy generation characteristics are numerically investigated in presence of single and double obstructive blocks within a square enclosure. It is found that the adiabatic block(s) enhance(s) the heat transfer marginally up to a critical size in a convection-dominated regime. On the other hand, the enhancement parameter is observed to be more with an increase in block size in a lower range of Rayleigh numbers for an isothermal block. The entropy generation for thermal irreversibility is observed to be several orders higher than that due to viscous dissipation in all cases. © 2013 Copyright Taylor and Francis Group, LLC.

Heat transfer enhancement and entropy generation in a square enclosure in the presence of adiabatic and isothermal blocks

This paper reports the results of a numerical and experimental investigation of mixed convection from a heat-generating element in a vented cavity with/without a baffle arrangement. Numerical investigations are carried out to determine the best position of the baffle on the walls of a rectangular chamber. The effect of varying the baffle heights and the position on the enhancement of heat transfer from the heater is investigated. Experiments were carried out for a heater located centrally in a parallelepiped that has an air inlet and an outlet port. The vertical baffle is fixed on the bottom wall of the chamber. After a detailed parametric study, correlations have been developed for the average Nusselt number and the maximum dimensionless temperature occurring in the heat generating element. Comparison of the numerical and experimental results for the geometry considered showed good agreement. © 2009 Springer-Verlag.

Heat and Mass Transfer/Waerme- und Stoffuebertragung

Effect of baffle on convective heat transfer from a heat generating element in a ventilated cavity

Numerical Heat Transfer and Fluid Flow

Heat Conduction

Numerical Heat Transfer, Part A: Applications

Numerical Predictions of Heat Transfer and Flow Structure in a Square Cross-Section Channel with Various Non-Spherical Indentation Dimples

International Communications in Heat and Mass Transfer

Computational analysis of mixed convection in a channel with a cavity heated from different sides

Journal	Data powered by TypesetNumerical Heat Transfer; Part A: Applications
Publisher	Data powered by TypesetTaylor and Francis Ltd.
ISSN	10407782
Open Access	No