Numerical investigation of thermal radiation effects on open cavity with discrete heat sources

Jamalabadi, Mohammad Yaghoub Abdollahzadeh; Ghassemi, Majid; Hamedi, Mohammad-Hossein

doi:10.1108/09615531311323791

Cited by 23 publications

(9 citation statements)

References 21 publications

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“…The impact of thermal radiation on convective transport is non-negligible and it can essentially modify the thermal and velocity patterns. Other useful results on complex natural convection can be found in Zargartalebi et al (2017), Miroshnichenko et al (2016), Sen and Sarkar (1995), Saravanan and Sivaraj (2017) and Abdollahzadeh Jamalabadi et al (2013).…”

Section: Thermal Convection and Radiationmentioning

confidence: 99%

Thermal convection and radiation in a rotating cabinet with time-dependent heat-generated solid element and heat-conducting solid walls

Mikhailenko

Ghalambaz

Sheremet

2021

HFF

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Purpose This paper aims to study numerically the simulation of convective–radiative heat transfer under an effect of variable thermally generating source in a rotating square chamber. The performed analysis deals with a development of passive cooling system for the electronic devices. Design/methodology/approach The domain of interest of size H rotating at a fixed angular velocity has heat-conducting solid walls with a constant cooling temperature for the outer boundaries of the vertical walls and with thermal insulation for the outer borders of the horizontal walls. The chamber has a heater on the bottom wall with a time-dependent volumetric heat generation. The internal surfaces of the walls and the energy element are both grey diffusive emitters and reflectors. The fluid is transparent to radiation. Computational model has been written using non-dimensional parameters and worked out by the finite difference technique. The effect of the angular velocity, volumetric heat generation frequency and surface emissivity has been studied and described in detail. Findings The results show that growth of the surface emissivity leads to a diminution of the mean heater temperature, while a weak rotation can improve the energy transport for low volumetric thermal generation frequency. Originality/value An efficient computational approach has been used to work out this problem. The originality of this work is to analyze complex (conductive–convective–radiative) energy transport in a rotating system with a local element of time-dependent volumetric heat generation. To the best of the authors’ knowledge, an interaction of major heat transfer mechanisms in a rotating system with a heat-generating element is scrutinized for the first time. The results would benefit scientists and engineers to become familiar with the analysis of complex heat transfer in rotating enclosures with internal heat-generating units, and the way to predict the heat transfer rate in advanced technical systems, in industrial sectors including transportation, power generation, chemical sectors and electronics.

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Section: Thermal Convection and Radiationmentioning

confidence: 99%

Thermal convection and radiation in a rotating cabinet with time-dependent heat-generated solid element and heat-conducting solid walls

Mikhailenko

Ghalambaz

Sheremet

2021

HFF

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“…Bialecki, 1993)) In addition to some previous work (Atkinson, 2000;Atkinson & Chandler, 1998;R. A. Bialecki, 1993;Jamalabadi, Ghassemi, & Hamedi, 2013;Laitinen & Tiihonen, 2001;N. Qatanani & Schulz, 2004, 2006 involving the heat radiation integral equation we are aware of some other work (Alzeer & Qatanani, 2008;Amiri, Mansouri, & Coelho, 2012;R.…”

Section: Introductionmentioning

confidence: 99%

“…Qatanani & Schulz, 2004, 2006 involving the heat radiation integral equation we are aware of some other work (Alzeer & Qatanani, 2008;Amiri, Mansouri, & Coelho, 2012;R. Bialecki, 1992;Campo, J. Salazar, J. Celentano, & Raydan, 2014;Jamalabadi et al, 2013;Laitinen & Tiihonen, 2001;N. Qatanani, Barham, & Heeh, 2007;Yousefi, Barikbin, & Dehghan, 2012) on heat conduction together with other heat transfer modes.…”

Section: Introductionmentioning

confidence: 99%

On the Numerical Treatment of Heat Conduction Problem by Boundary Element and Multigrid Methods

Sa'adAldin¹,

Qatanani²

2019

An-Najah University Journal for Research - A

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In this work we consider the boundary integral equation describing the steady state heat conduction taking place in three dimensional enclosure geometries. For the numerical realization of the Fredholm integral equation, we use the boundary element method based on the Galerkin weighted residuals method. Consequently, converting the original integral equation into a set of algebraic equations. We apply the multigrid iterations to solve the system of linear equations. To demonstrate the efficiency of this iterative scheme, we construct numerical example. في هذا العمل، نعتبر المعادلة التكاملية الحدودية الي تصف التوصيل الحراري الثابت للدولة الذي يحدث في هندسيات الضميمة ثلاثية الأبعاد. للتحقيق العددي لمعادلة فريدهولم التكاملية، نستخدم طريقة العناصر الحدودية على أساس طريقة المتبقيات المرجحة لغالركن، وبالتالي، تحويل المعادلة التكاملية الأصلية إلى مجموعة من المعادلات الجبرية. نطبق التكرار المتعدد لحل نظام المعادلات الخطية. لشرح كفاءة هذا المخطط التكراري، نبني مثالاً عددياً.

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“…Heat transfer exchange in fluid flows [ 1 ] has numerous modern and common applications, including electronic cooling [ 2 ], mass transport [ 3 ], life [ 4 ], and cooling frameworks with phase change materials [ 5 ]. Conventional liquids, for example, water, oil, and glycols have poor heat transfer exchange because of their low heat transfer conductivities [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

“…Nanofluids are drawing extraordinary intention with their tremendous potential to improve execution properties, particularly with the regard to warm exchange [ 7 ]. Nanofluids as a combination of metal, polymer, or metal oxide in a Newtonian liquid (mostly water or alcohol) present specific features in various fields of engineering [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ] and biology [ 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. In the field of heat transfer, the higher value of thermal conductivity in nanofluids provided by solid nanoparticles increases convective heat transfer in comparison with ordinary liquids.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of Nanoparticle Enhanced Phan-Thien–Tanner Flow of a Viscoelastic Fluid in a Microchannel

Jamalabadi

2018

Entropy

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The excellent thermal characteristics of nanoparticles have increased their application in the field of heat transfer. In this paper, a thermophysical and geometrical parameter study is performed to minimize the total entropy generation of the viscoelastic flow of nanofluid. Entropy generation with respect to volume fraction (<0.04), the Reynolds number (20,000-100,000), and the diameter of the microchannel (20-20,000 µm) with the circular cross-section under constant flux are calculated. As is shown, most of the entropy generation owes to heat transfer and by increasing the diameter of the channel, the Bejan number increases. The contribution of heat entropy generation in the microchannel is very poor and the major influence of entropy generation is attributable to friction. The maximum quantity of in-channel entropy generation happens in nanofluids with TiO 2 , CuO, Cu, and Ag nanoparticles, in turn, despite the fact in the microchannel this behavior is inverted, the minimum entropy generation occurs in nanofluids with CuO, Cu, Ag, and TiO 2 nanoparticles, in turn. In the channel and microchannel for all nanofluids except water-TiO 2 , increasing the volume fraction of nanoparticles decreases entropy generation. In the channel and microchannel the total entropy generation increases by augmentation the Reynolds number.

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Numerical investigation of thermal radiation effects on open cavity with discrete heat sources

Cited by 23 publications

References 21 publications

Thermal convection and radiation in a rotating cabinet with time-dependent heat-generated solid element and heat-conducting solid walls

Thermal convection and radiation in a rotating cabinet with time-dependent heat-generated solid element and heat-conducting solid walls

On the Numerical Treatment of Heat Conduction Problem by Boundary Element and Multigrid Methods

Optimal Design of Nanoparticle Enhanced Phan-Thien–Tanner Flow of a Viscoelastic Fluid in a Microchannel

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