Fluid flow and heat transfer of opposing mixed convection adjacent to downward‐facing, inclined heated plates

Kitamura, Keiichi; Matsumoto, Jutaro; Mitsuishi, Akihiko; Misumi, Toshiyuki

doi:10.1002/htj.20233

Cited by 6 publications

(2 citation statements)

References 12 publications

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“…[13][14][15], and from inclined plates, e.g. [16][17][18][19][20]. Basically, all of these studies of mixed convective heat transfer have been concerned with wide plates, i.e., with situations in which the flow over the plate can be assumed to be two-dimensional.…”

Section: Imentioning

confidence: 99%

A Numerical Study Of Mixed Convective Heat Transfer From Narrow Side-Up Two-Sided Isothermal Flat Plates

Elkhmri¹,

Oosthuizen²

2021

Progress in Canadian Mechanical Engineering. Volume 4

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Many studies of mixed convective heat transfer from heated flat plates which are in the same plane as the forced flow over the plate surface are available, most of these studies dealing with wide plates. However, there exist practical situations in which there is mixed convection from thin two-sided plates that lie in a vertical plane in a horizontal forced flow, the plate thus being at right angles to the forced flow. In some such cases the plates are also narrow, and the relative plate width is expected to have a significant influence on the heat transfer rate in such a case. The present study therefore numerically investigates how the relative width of the plate affects the mixed convective heat transfer rate from a thin narrow side-up rectangular plate. It has been assumed that the plate surfaces are isothermal and at the same temperature. The Boussinesq approach has been adopted. Conditions under which laminar, transitional, and turbulent flows exist have been considered, the standard k-epsilon turbulence model being used with buoyancy force effects being accounted for. The solution has been obtained using ANSYS FLUENT © . The mean heat transfer rates from the surfaces of the plate have been expressed in terms of Nusselt numbers based on the length of the plate. These Nusselt numbers are dependent on the Rayleigh number and the Reynolds number based on the plate length, on the ratio of the plate width to the plate length, and on the Prandtl number. Results have only been obtained for a Prandtl number of 0.74. Variations of the Nusselt numbers with Rayleigh number and with Reynolds number for various dimensionless plate widths have been obtained. The results show that the effect of the plate width can be very significant.

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Section: Imentioning

confidence: 99%

A Numerical Study Of Mixed Convective Heat Transfer From Narrow Side-Up Two-Sided Isothermal Flat Plates

Elkhmri¹,

Oosthuizen²

2021

Progress in Canadian Mechanical Engineering. Volume 4

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show abstract

“…Typical of these studies are those described in [1][2][3][4][5][6][7][8][9][10][11][12]. Some studies of mixed convective heat transfer from horizontal plates, [13][14][15], and from inclined plates, [16][17][18][19][20], have also been undertaken. Essentially all of the studies of mixed convective heat transfer from vertical flat plates mentioned above have been concerned with wide plates, i.e., with situations in which the flow over the plate can be assumed to be two-dimensional.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study of Assisting Mixed Convective Heat Transfer From Narrow Isothermal Vertical Flat Plates

Elkhmri

Oosthuizen

2020

Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC)

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Many studies of mixed convective heat transfer from heated flat plates with the forced flow parallel to the plate surface are available, most of these studies dealing with wide plates. However, practical situations exist in which there is effectively mixed convective heat transfer from narrow plates and in such cases the relative plate width is expected to have a significant influence on the heat transfer rate. The present study numerically investigates how the relative width of the plate affects the mixed convective heat transfer rate from a thin narrow vertical plate. It has been assumed that the plate surfaces are isothermal. The Boussinesq approach has been adopted. The solution has been obtained using ANSYS FLUENT ©. The mean heat transfer rate from the heated surface of the plate has been expressed in terms of a Nusselt number based on the length of the plate, this Nusselt numbers being dependent on the Rayleigh number and the Reynolds number based on the plate length, on the ratio of the plate width to the plate length, and on the Prandtl number. Results have only been obtained for a Prandtl number of 0.74. Variations of the Nusselt numbers with Rayleigh number and with Reynolds number for various dimensionless plate widths have been obtained, the results showing that the effect of the plate width on the heat transfer rate can be significant.

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Effect of heated wall inclination on natural convection heat transfer in water with near-wall injection of millimeter-sized bubbles

Kitagawa

Denissenko

Murai

2017

International Journal of Heat and Mass Transfer

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A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP url' above for details on accessing the published version and note that access may require a subscription. ABSTRACT Natural convection heat transfer from a heated wall in water with near-wall injection of millimeter-sized bubbles is studied experimentally. Velocity and temperature measurements are conducted in the near-wall region. In the range of the heated wall angles from 0 to 40˚ from the vertical, the heat transfer coefficient increases by up to an order of magnitude with bubble injection. The ratio of the heat transfer coefficient with bubble injection to that without injection increases with the wall inclination angle. Based upon measured liquid temperature distributions and liquid flow velocity profiles, enhancement of heat transfer by bubble injection is explained by two mechanisms. First, wall-parallel transport of cold liquid into the thermal boundary layer is enhanced by the bubbledriven flow. Second, wall-normal mixing of warm liquid and cold liquid occurs, as a result of wall-normal velocity fluctuations of the liquid phase activated by a combination of bubble rising motion, vortex shedding from the bubbles, and unsteady vortices formed within the boundary layer. The unsteady vortices travel along the wall together with the bubbles, primarily contributing to the enhancement of heat transfer at higher wall inclination angles.

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Fluid flow and heat transfer of opposing mixed convection adjacent to downward‐facing, inclined heated plates

Cited by 6 publications

References 12 publications

A Numerical Study Of Mixed Convective Heat Transfer From Narrow Side-Up Two-Sided Isothermal Flat Plates

A Numerical Study Of Mixed Convective Heat Transfer From Narrow Side-Up Two-Sided Isothermal Flat Plates

A Numerical Study of Assisting Mixed Convective Heat Transfer From Narrow Isothermal Vertical Flat Plates

Effect of heated wall inclination on natural convection heat transfer in water with near-wall injection of millimeter-sized bubbles

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