Conjugate natural convection combined with surface thermal radiation in an air filled cavity with internal heat source

Martyushev, S. G.; Sheremet, Mikhail А.

doi:10.1016/j.ijthermalsci.2013.08.012

Cited by 78 publications

(54 citation statements)

References 27 publications

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“…Among the recent studies, for example, Martyushev and Sheremet [6] examined the variation of Nu and maximum velocity for different thermal conductivity ratio of wall/fluid in a cavity by considering convective and radiative heat transfer and observed similar behavior. They also noted similar trends with increasing Rayleigh number.…”

Section: International Journal Of Materials Mechanics and Manufacturmentioning

confidence: 96%

“…With nondimensionalization of temperature, (5) becomes (6) where Bi= hL/k is the Biot number. Due to infinitesimally thin wall, Bi here ends up coupling thermal conductivity of the fluid on one side of the wall with the heat transfer coefficient on the other, which is unconventional for this number.…”

Section: A Boundary Conditionsmentioning

confidence: 99%

“…As a result, the majority of literature on numerical studies of natural convection is based on finite difference techniques, with most employing the SIMPLE (Semi-Implict Method for Pressure Linked Equations), an algorithm developed by Patankar [4] to resolve the coupling between velocity and pressure. Many numerical studies, for example, Rajkumar et al [5], Martyushev and Sheremet [6], and Odewole and Edwards [7] selected to use the commercially available software package FLUENT with the solution option of SIMPLE. In the present study, a two-dimensional, time dependent numerical approach based on the projection or fractional step formulation method is applied to buoyancy-driven flow in a vertical slot with a narrow upper section as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of Buoyancy-Driven Flow in a Slot with Different Biot Numbers

Selamet¹,

Selamet²

2014

IJMMM

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Abstract-The projection method involving a Godunov type discretization for convective terms is applied to natural convection in water within a vertical slot. The variation of Nusselt number is examined for a range of Rayleigh numbers by imposing elevated temperature on the left wall and allowing convective heat transfer on the right. The results illustrate that heat transfer increases asymptotically with increasing Biot number. The rate of increase is a function of Rayleigh number and becomes more significant at higher Rayleigh numbers, as expected.

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Section: International Journal Of Materials Mechanics and Manufacturmentioning

confidence: 96%

Section: A Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Prediction of Buoyancy-Driven Flow in a Slot with Different Biot Numbers

Selamet¹,

Selamet²

2014

IJMMM

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“…Since the temperature difference is insignificant, by considering the buoyancy force effects, dependence of energy and flow equations on temperature the Boussinesq model has been used. The time step used to solve the differential equations has been chosen to be ∆τ = 10 -3 [11,12,19]. …”

Section: Governing Equationsmentioning

confidence: 99%

“…In view of a variety of shapes and thermal conditions of these devices the obstructions are considered in the form of partitions, partial baffles and discrete bodies and are assumed to be either isothermal or iso-flux or heat generating. Among the various known cooling techniques used in such applications, natural convection cooling using air as the medium is the most widely used one as it is simple to design, cheap, noise free and highly reliable [1][2][3][4][5][6][7][8][9][10][11][12][13]. For example, Sharma et al [9] studied the interaction of turbulent natural convection and surface thermal radiation in inclined square enclosures.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of a Corrugated Heat Source Cavity: A Full Convection-Conduction-Radiation Coupling

Sadripour¹

2017

AJAE

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Abstract:In present study a numerical analysis of complex heat transfer (turbulent natural convection, conduction and surface thermal radiation) in a rectangular enclosure with a heat source has been carried out. The finite volume method based on SIMPLEC algorithm has been utilized. The effects of Rayleigh number in a range from 10 8 to 10 11 , internal surface emissivity 0≤ε˂1 on the fluid flow and heat transfer have been extensively explored. Detailed results including temperature fields, flow profiles, and average Nusselt numbers have been presented. In this investigation it has been tried to study the shape of heat source influence on heat transfer and fluid field in the considered domain. According to results in low emissivity values usage of circular obstacles is recommended. Although in high emissivity values using rectangular obstacles lead to more efficiency.

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Optimal design with entropy generation minimization approach in combined natural convection with surface radiation in a two‐dimensional enclosure

Dashti

Ali

2019

Heat Trans. Asian Res.

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Analysis of combined natural convection with surface radiation in a two-dimensional enclosure is carried out. To search the optimal location of the heat source, the entropy generation minimization approach and conventional heat transfer parameters are used and compared. Air is considered as an incompressible fluid and transparent media filling the enclosure with a steady and laminar regime. The enclosure internal surfaces are also gray, opaque, and diffused. The governing equations are solved using the finite difference approach. The results show that with increase in emissivity, entropy generation decreases, and as the Rayleigh number increases, the rate of entropy generation increases. Furthermore, optimum design with the maximum dimensionless temperature and convective Nusselt number confirms the applicability of the second law for optimal design. K E Y W O R D S constant flux heat source, entropy generation minimization, natural convection, optimal search, surface radiation

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Conjugate natural convection combined with surface thermal radiation in an air filled cavity with internal heat source

Cited by 78 publications

References 27 publications

Prediction of Buoyancy-Driven Flow in a Slot with Different Biot Numbers

Prediction of Buoyancy-Driven Flow in a Slot with Different Biot Numbers

Numerical Investigation of a Corrugated Heat Source Cavity: A Full Convection-Conduction-Radiation Coupling

Optimal design with entropy generation minimization approach in combined natural convection with surface radiation in a two‐dimensional enclosure

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