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

Radhakrishnan, T. V.; Joseph, George; Balaji, C.; Venkateshan, S. P.

doi:10.1007/s00231-008-0474-5

Cited by 14 publications

(8 citation statements)

References 18 publications

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“…The applications of mixed convection are immense ranging from scientific applications to various engineering processes. A number of applications of mixed convection involve electronic equipment cooling (Ghasemi, 2005; Radhakrishnan et al , 2009; Venkatachalapathy and Udayakumar, 2012; Ajmera and Mathur, 2015) to achieve enhanced heat transfer performance for smaller equipment size. A few recent applications also involve solar ponds, collectors and heaters (Tonui and Tripanagnostopoulos, 2008; Hobbi and Siddiqui, 2009), air cooling (Moraga and Lopez, 2004; Bianco et al , 2009; Minaei et al , 2014), heat exchangers (Voicu et al , 2007; Garoosi et al , 2015; Andrzejczyk and Muszynski, 2018; Bozor and Siavashi, 2019; Ren et al , 2019), desalination (Nasr et al , 2012; Pismenskiy et al , 2015), float glass production (Prieto et al , 2002; Antar et al , 2014) and nuclear reactors (Kumar et al , 2011; Cooper et al , 2016; Wang et al , 2017; Bieder et al , 2018).…”

Section: Discussionmentioning

confidence: 99%

“…A number of experimental works on mixed convection were also carried out by earlier researchers (Chen and Cheng, 2004; Ji et al , 2007; Niu et al , 2007; Radhakrishnan et al , 2009; Venkatachalapathy and Udayakumar, 2012; Dogan and Sivrioglu, 2012; Chen et al , 2012; Ajmera and Mathur, 2015, 2016; Tian et al , 2018; Andrzejczyk and Muszynski, 2018; Contreras et al , 2019). These experimental works are not elaborated for brevity.…”

Section: Experimental Studies On Mixed Convectionmentioning

confidence: 99%

“…Experimental predictions involve fluid flow patterns which were analyzed via Particle Image Velocimetry or smoke visualization methods and temperature distributions, which were analyzed via thermocouples at various locations. The influence of Gr and Re for cooling discrete heat sources (Radhakrishnan et al , 2009; Venkatachalapathy and Udayakumar, 2012; Ajmera and Mathur, 2015; Contreras et al , 2019), array of fins (Dogan and Sivrioglu, 2012), rectangular channels (Niu et al , 2007; Ajmera and Mathur, 2016; Tian et al , 2018) was established in experimental works. The evolution of flow patterns and thermal characteristics in a wall driven cavity (Chen and Cheng, 2004; Ji et al , 2007; Chen et al , 2012) and mixed convection effects in heat exchangers (Andrzejczyk and Muszynski, 2018) were also studied.…”

Section: Experimental Studies On Mixed Convectionmentioning

confidence: 99%

“…Various researchers also performed experimental works pertaining to mixed convection (Mansour and Viskanta, 1994; Chen and Cheng, 2004; Ji et al , 2007; Niu et al , 2007; Radhakrishnan et al , 2009; Venkatachalapathy and Udayakumar, 2012; Chen et al , 2012; Dogan and Sivrioglu, 2012; Ajmera and Mathur, 2015, 2016; Tian et al , 2018; Andrzejczyk and Muszynski, 2018; Contreras et al , 2019). The practical applications of mixed convection were explored in the earlier works (Prieto et al , 2002; Moraga and Lopez, 2004; Ghasemi, 2005; Voicu et al , 2007; Tonui and Tripanagnostopoulos, 2008; Bianco et al , 2009; Hobbi and Siddiqui, 2009; Kumar et al , 2011; Nasr et al , 2012; Antar et al , 2014; Minaei et al , 2014; Garoosi et al , 2015; Pismenskiy et al , 2015; Cooper et al , 2016; Wang et al , 2017; Bieder et al , 2018; Bozor and Siavashi, 2019; Ren et al , 2019).…”

Section: Introductionmentioning

confidence: 99%

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A comprehensive review on mixed convection for various patterns of kinematically and thermally induced scenarios within cavities

Lukose

Basak

2021

HFF

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Purpose The purpose of this paper is to address various works on mixed convection and proposes 10 unified models (Models 1–10) based on various thermal and kinematic conditions of the boundary walls, thermal conditions and/ or kinematics of objects embedded in the cavities and kinematics of external flow field through the ventilation ports. Experimental works on mixed convection have also been addressed. Design/methodology/approach This review is based on 10 unified models on mixed convection within cavities. Models 1–5 involve mixed convection based on the movement of single or double walls subjected to various temperature boundary conditions. Model 6 elucidates mixed convection due to the movement of single or double walls of cavities containing discrete heaters at the stationary wall(s). Model 7A focuses mixed convection based on the movement of wall(s) for cavities containing stationary solid obstacles (hot or cold or adiabatic) whereas Model 7B elucidates mixed convection based on the rotation of solid cylinders (hot or conductive or adiabatic) within the cavities enclosed by stationary or moving wall(s). Model 8 is based on mixed convection due to the flow of air through ventilation ports of cavities (with or without adiabatic baffles) subjected to hot and adiabatic walls. Models 9 and 10 elucidate mixed convection due to flow of air through ventilation ports of cavities involving discrete heaters and/or solid obstacles (conductive or hot) at various locations within cavities. Findings Mixed convection plays an important role for various processes based on convection pattern and heat transfer rate. An important dimensionless number, Richardson number (Ri) identifies various convection regimes (forced, mixed and natural convection). Generalized models also depict the role of “aiding” and “opposing” flow and combination of both on mixed convection processes. Aiding flow (interaction of buoyancy and inertial forces in the same direction) may result in the augmentation of the heat transfer rate whereas opposing flow (interaction of buoyancy and inertial forces in the opposite directions) may result in decrease of the heat transfer rate. Works involving fluid media, porous media and nanofluids (with magnetohydrodynamics) have been highlighted. Various numerical and experimental works on mixed convection have been elucidated. Flow and thermal maps associated with the heat transfer rate for a few representative cases of unified models [Models 1–10] have been elucidated involving specific dimensionless numbers. Originality/value This review paper will provide guidelines for optimal design/operation involving mixed convection processing applications.

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Section: Discussionmentioning

confidence: 99%

Section: Experimental Studies On Mixed Convectionmentioning

confidence: 99%

Section: Experimental Studies On Mixed Convectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A comprehensive review on mixed convection for various patterns of kinematically and thermally induced scenarios within cavities

Lukose

Basak

2021

HFF

View full text Add to dashboard Cite

show abstract

“…They have ascertained that due to the geometry attributes and gravity force direction the complicated circulation patterns and energy transference structures are formed within the chamber. Radhakrishnan et al (2009) have reported the outcomes of mixed convection analysis in a vented chamber with/ without obstacles under an influence of a heat-generating element. It has been revealed that a centered location of a baffle on the bottom surface characterizes the effective liquid circulation with the energy transport augmentation up to 50% compared to the case without obstacle.…”

Section: Introductionmentioning

confidence: 99%

Entropy generation in MHD free convection of nanoliquid within a square open chamber with a solid body

Chinnasamy

Vignesh

Sheremet

2021

HFF

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Purpose The study aims to investigate magnetohydrodynamics thermal convection energy transference and entropy production in an open chamber saturated with ferrofluid having an isothermal solid block. Design/methodology/approach Analysis of thermal convection phenomenon was performed for an open chamber saturated with a nanofluid having an isothermal solid unit placed inside the cavity with various aspect ratios. The left border temperature is kept at Tc. An external cooled nanofluid of fixed temperature Tc penetrates into the domain from the right open border. The nanofluid circulation is Newtonian, incompressible, and laminar. The uniform magnetic field of strength B at the tilted angle of γ is applied. The finite volume technique is used to work out the non-linear equations of liquid motion and energy transport. For Rayleigh number (Ra=1e+7), numerical simulations were executed for varying the solid volume fractions of the nanofluid (ϕ = 0.01–0.04), the aspect ratios of a solid body (As = 0.25–4), the Hartmann number (Ha = 0–100), the magnetic influence inclination angle (γ = 0–π/2) and the non-dimensional temperature drop (Ω = 0.001–0.1) on the liquid motion, heat transference and entropy production. Findings Numerical outcomes are demonstrated by using isolines of temperature and stream function, profiles of mean Nusselt number and entropy generations. The results indicate that the entropy generation rate and mean Nu can be decreased with an increase in Ha. The inner solid block of As = 0.25 reflects the maximum heat transfer rate in comparison with other considered blocks. The addition of nano-sized particles results in a growth of energy transport and mean entropy generations. Originality/value An efficient computational technique has been developed to solve natural convection problem for an open chamber. The originality of this research is to scrutinize the convective transport and entropy production in an open domain with inner body. The outcomes would benefit scientists and engineers to become familiar with the investigation of convective energy transference and entropy generation in open chambers with inner bodies, and the way to predict the energy transference strength in the advanced engineering systems.

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Mixed convection in a baffled grooved channel

Sharma

Mahapatra

Manna

et al. 2015

Sadhana

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In the present numerical work, flow structure and heat transfer characteristics are investigated in a baffled grooved channel, differentially heated from the sides. The baffle is placed vertically downward from the top wall of grooved channel geometry, with the motive of diverting outside forced flow towards the inside of the square cavity. In-house CFD code based on finite volume method has been used to solve the 2D equations of continuity, momentum and energy. The effect of change in baffle position and height is investigated in the range of Richardson numbers 0.1 to 10. For the present study, external flow from both left and right of the grooved channel are considered. A remarkable enhancement of heat transfer is observed in presence of baffle. The study has also pointed out that for optimal performance, the position and height of the baffle need to be adjusted depending on the direction of external flow.

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

Cited by 14 publications

References 18 publications

A comprehensive review on mixed convection for various patterns of kinematically and thermally induced scenarios within cavities

A comprehensive review on mixed convection for various patterns of kinematically and thermally induced scenarios within cavities

Entropy generation in MHD free convection of nanoliquid within a square open chamber with a solid body

Mixed convection in a baffled grooved channel

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