Preliminary experiments on the control of natural convection in differentially-heated cavities

Penot, François; Skurtys, Olivier; Saury, Didier

doi:10.1016/j.ijthermalsci.2010.05.008

Cited by 20 publications

(11 citation statements)

References 23 publications

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“…It was concluded that flow and thermal fields can be effectively controlled by periodical heating; thus, unsteadiness was generated, which resulted in higher velocities and local temperature gradients. However, no heat transfer enhancement effect has been achieved, in accord with the literature (Penot et al [78]). …”

Section: Convective Heat Transfersupporting

confidence: 87%

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Synthetic and Continuous Jets Impinging on a Circular Cylinder

Broučková

Trávníček

Vít

2018

Heat Transfer Engineering

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Declaration of authorshipI hereby confirm that the submitted work is entirely my own and was written only with help of referenced literature. iv AbstractSynthetic and continuous jets impinging onto an heated circular cylinder were investigated.The study was performed experimentally. For this reason, a piezoelectrically driven actuator with water as the working fluid was designed. The basic parameters of the experiments were: the slot nozzle width was 0.36 mm, the aspect ratio of the slot was 111, the cylinder diameter was 1.2 mm, and the cylinder-to-nozzle spacing related to the slot width was 5-21.

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Section: Convective Heat Transfersupporting

confidence: 87%

“…An example of active control of natural convection was proposed by Penot et al [78]. They tried to enhance natural convective heat transfer in air via a differentially-heated cavity.…”

Section: Convective Heat Transfermentioning

confidence: 99%

Synthetic and Continuous Jets Impinging on a Circular Cylinder

Broučková

Trávníček

Vít

2018

Heat Transfer Engineering

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“…The basic setup for such flows, which has also attracted most 20 attention from researchers, is a rectangular cavity filled with dry air whose opposing vertical walls are heated differentially [3,4]. Detailed data on flow, turbulence, and heat transfer have been collected through various experiments [5][6][7]. Following this, numerical researchers have also been quick to respond to the experimental literature by conducting validation and exploratory studies on this very topic [8].…”

Section: Introductionmentioning

confidence: 99%

“…Following this, numerical researchers have also been quick to respond to the experimental literature by conducting validation and exploratory studies on this very topic [8]. 25 The interest seems to be ongoing because more challenging situations are emerging with time [7,9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Emissivity on the Heat and Mass Transfer of Humid Air in a Cavity Filled with Solid Obstacles

Iyi

Hasan

Penlington

2014

Numerical Heat Transfer, Part A: Applications

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Section 6 of the "Repository policy for OpenAIR @ RGU" (available from http://www.rgu.ac.uk/staff-and-currentstudents/library/library-policies/repository-policies) provides guidance on the criteria under which RGU will consider withdrawing material from OpenAIR. If you believe that this item is subject to any of these criteria, or for any other reason should not be held on OpenAIR, then please contact openair-help@rgu.ac.uk with the details of the item and the nature of your complaint. The work reported here is a 2D numerical study on the buoyancy-driven low-speed turbulent flow of humid air inside a rectangular cavity partially filled with solid cylindrical objects for 10 a Rayleigh number of 1.45 Â 10 9 . Variations of Nusselt number, buoyancy flux, vapor mass fraction, and turbulence viscosity ratio are presented for various emissivity values of wall surfaces. It was observed that during the natural convection process, radiation effects are very significant and the air/water vapor combination results in a small increase in heat transfer as compared with the pure natural convection of dry air. 15

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“…The basic set up for such flows, which has also attracted most attention from researchers, is a rectangular cavity whose vertical walls are heated differentially [Barakos and Mitsoulis 1994, Calcagni et Mixture (air and water vapour) p product the fact that such a rig is relatively easy to fabricate, detailed data on the flow, turbulence and heat transfer have been collected through experiments [Ampofo and Karayiannis 2003, Dafa' Alla and Betts 1996, Penot et al 2010. Following on, numerical scientists had also been quick to respond to the experimental literature by conducting validation and exploratory studies on this very topic Liu 2004, Iyi et al 2011].…”

Section: Introductionmentioning

confidence: 99%

Interaction Effects Between Surface Radiation and Double-Diffusive Turbulent Natural Convection in an Enclosed Cavity Filled With Solid Obstacles

Iyi

Hasan

Penlington

2012

Proceeding of Proceedings of CHT-12. ICHMT International Symposium on Advances in Computational Heat Transfer.

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Citation: Iyi, Draco, Hasan, Reaz and Penlington, Roger (2012) Interaction effects between surface radiation and double-diffusive turbulent natural convection in an enclosed cavity filled with solid obstacles. In: International Symposium on Advances in Computational Heat Transfer ICHMT, 1-6 July 2012, Bath, England. URL:This version was downloaded from Northumbria Research Link: http://nrl.northumbria.ac.uk/8446/ Northumbria University has developed Northumbria Research Link (NRL) to enable users to access the University's research output. Copyright © and moral rights for items on NRL are retained by the individual author(s) and/or other copyright owners. Single copies of full items can be reproduced, displayed or performed, and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided the authors, title and full bibliographic details are given, as well as a hyperlink and/or URL to the original metadata page. The content must not be changed in any way. Full items must not be sold commercially in any format or medium without formal permission of the copyright holder. The full policy is available online: http://nrl.northumbria.ac.uk/policies.html This document may differ from the final, published version of the research and has been made available online in accordance with publisher policies. To read and/or cite from the published version of the research, please visit the publisher's website (a subscription may be required.) ABSTRACT The work reported here is a 2D numerical study on the buoyancy-driven low speed flow of humid air inside a rectangular cavity partially filled with solid cylindrical objects and whose vertical walls are maintained at 1.2 and 21 o C. This is a case of double diffusion where both temperature and concentration gradients are significant. Detailed calculations were carried out and results compared with reliable data, with the aim of investigating the influence of surface emissivity on heat and moisture transport. The Rayleigh number of the fluid mixture (air and water vapour) based on the height of the vertical wall is found to be 1.45 x 10 9 . In the computations, turbulent fluxes of the momentum, heat and mass were modelled by low-Re (Launder-Sharma) k-ε eddy viscosity model. The effect of radiation has been found to be significant even for the moderate temperature difference of 19.8 o C between the hot and the cold walls with the humid air participating in the radiation heat transfer. Variations of average Nusselt number and buoyancy flux are analysed and profiles of turbulent quantities are studied in order to observe the net effect of the intensity of turbulence. It has been found that a change in surface emissivity influences the humidity distribution and heat transfer within the cavity. It was also observed that during natural convection process the air/water vapour combination results in an increase in the heat transfer as compared to pure natural convection. An increase in he...

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Preliminary experiments on the control of natural convection in differentially-heated cavities

Cited by 20 publications

References 23 publications

Synthetic and Continuous Jets Impinging on a Circular Cylinder

Synthetic and Continuous Jets Impinging on a Circular Cylinder

Effect of Emissivity on the Heat and Mass Transfer of Humid Air in a Cavity Filled with Solid Obstacles

Interaction Effects Between Surface Radiation and Double-Diffusive Turbulent Natural Convection in an Enclosed Cavity Filled With Solid Obstacles

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