Simulation of mixed convection heat transfer in a horizontal channel with an open cavity containing a heated hollow cylinder

Rahman, M. M.; Parvin, Salma; Rahim, N.A.; Hasanuzzaman, M.; Saidur, R.

doi:10.1002/htj.21002

Cited by 17 publications

(14 citation statements)

References 27 publications

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“…They concluded that the heat transfer rate was increased by increasing the Reynolds number for fixed values of the Richardson number. Extra references about the mixed convection in an open enclosure‐channel assembly can be found in References . To the authors’ best knowledge, there is a lack of research dealing with the mixed convection in an open enclosure‐channel assembly, especially when the geometry of the enclosure is considered complicated.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer inside a horizontal channel with an open trapezoidal enclosure subjected to a heat source of different lengths

Laouira

Mebarek‐Oudina

Hussein

et al. 2019

Heat Trans. Asian Res.

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The heat transfer phenomena inside a horizontal channel with an open trapezoidal enclosure subjected to a heat source of different lengths was investigated numerically in the present work. The heat source is considered as a local heating element of varying length, which is embedded at the bottom wall of the enclosure and maintained at a constant temperature.The air flow enters the channel horizontally at a constant cold temperature and a fixed velocity. The other walls of the enclosure and the channel are kept thermally insulated. The flow is assumed laminar, incompressible, and two-dimensional, whereas the fluid is considered Newtonian. The results are presented in the form of the contours of velocity, isotherms, and Nusselt numbers profiles for various values of the dimensionless heat source lengths (0.16 ≤ ε ≤ 1). while, both Prandtl and Reynolds numbers are kept constant at (Pr = 0.71) and (Re = 100), respectively. The results indicated that the distribution of the isotherms depends significantly on the length of the heat source. Also, it was noted that both the local and the average Nusselt numbers increase as the local heat source length increases. Moreover, the maximum temperature is located near the heat source location.

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Section: Introductionmentioning

confidence: 99%

Heat transfer inside a horizontal channel with an open trapezoidal enclosure subjected to a heat source of different lengths

Laouira

Mebarek‐Oudina

Hussein

et al. 2019

Heat Trans. Asian Res.

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“…Independence test of grid and time-step intervals for Re=550, D=0.2 and S=0.2 Comparison of area-averaged Nusselt number of numerical simulation with empirical correlation(9) and other researches…”

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confidence: 93%

“…The distributions of streamlines, isotherms and heat transfer coefficient were reported for wide ranges of the parameters, including Reynolds number, Richardson number, Prandtl number and some physical parameters. Rahman et al [9] numerically investigated mixed convective flow and heat transfer of a heated hollow cylinder (uniform heat flux) inside an open cavity attached with a horizontal channel for 10 3 <Ra<10 5 , 0.7<Pr<7 and ratio of solid to fluid thermal conductivities from 0.2 to 50. Mamun et al [10] solved the mixed convection heat transfer characteristics within a ventilated square cavity with a heated hollow cylinder.…”

Section: Introductionmentioning

confidence: 99%

“…The distributions of streamlines, isotherms and heat transfer coefficient were reported for wide ranges of the parameters, including Reynolds number, Richardson number, Prandtl number and some physical parameters. Rahman et al (2012) thermal conductivities from 0.2 to 50. Mamun et al (2010) solved the mixed convection heat transfer characteristics within a ventilated square cavity with a heated hollow cylinder.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation of transient forced convection in a square enclosure containing two heated circular cylinders

Talkhoncheh

Wang

et al. 2016

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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The present work is aimed to study unsteady forced convection of two heated horizontal cylinders confined in a 2-D square enclosure. The widths of the inlet and outlet ports are equal to 10% of the enclosure height. The cylinders are located at the middle of the enclosure height and the walls of the cavity are adiabatic. The simulations are carried out for Reynolds numbers between 380 and 550 and dimensionless horizontal distances of cylinders at 0.1, 0.2 and 0.3, respectively. The results indicate that the variation of the area-averaged Nusselt number strongly depends on the Reynolds number. On the contrary, the effect of cylinders' spacing on heat transfer was found to be nearly negligible for Re<460. It is also observed that steady state flow and heat transfer shift to periodical oscillation, and ultimately chaotic oscillation in non-dimensional cylinders distance of 0.1; however the sequence of appearing this route is completely different for higher cylinder spacing.

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“…These orifices have different widths. Moreover, there are other works on mixed convection in an enclosure under different situations 20‐26 …”

Section: Introductionmentioning

confidence: 99%

Computational study of thermal buoyancy from two confined cylinders within a square enclosure wifth single inlet and outlet ports

Laidoudi

Makinde

2020

Heat Trans

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This article is devoted to investigating the mixed convection arising from two equally hot circular cylinders embedded in a square cavity of adiabatic surfaces. This cavity is filled with an incompressible fluid and contains single entry and outlet orifices. The heated cylinders are assumed to be arranged side‐by‐side with a fixed gap within the square cavity. Based on some simplifying assumptions, the nonlinear governing equations that express the principle of conservation of mass, momentum, and energy are obtained and numerically solved using a Computational fluid dynamics package ANSYS‐CFX with finite volume technique. Pertinent results showing the roles of embedded parameters such as Richardson number (Ri = 0 to 1) and Reynolds number (Re = 1 to 40) at Prandtl number (Pr = 1) on the overall fluid flow and temperature patterns are graphically depicted in the form of representative streamlines and isotherms. The values of average Nusselt number and total drag coefficient (CD) for both representative cylinders are also computed and discussed. Generally, an increase in buoyancy force augments the effectiveness of heat transfer only of the down cylinder. Also, a rise in Re and/or Ri numbers augment the flow instability.

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Simulation of mixed convection heat transfer in a horizontal channel with an open cavity containing a heated hollow cylinder

Cited by 17 publications

References 27 publications

Heat transfer inside a horizontal channel with an open trapezoidal enclosure subjected to a heat source of different lengths

Heat transfer inside a horizontal channel with an open trapezoidal enclosure subjected to a heat source of different lengths

Numerical simulation of transient forced convection in a square enclosure containing two heated circular cylinders

Computational study of thermal buoyancy from two confined cylinders within a square enclosure wifth single inlet and outlet ports

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