Role of multiple solar heaters along the walls for the thermal management during natural convection in square and triangular cavities

Das, Debopam; Lukose, Leo; Basak, Tanmay

doi:10.1016/j.renene.2017.11.008

Cited by 15 publications

(8 citation statements)

References 44 publications

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“…In the case of clear fluid, it is possible to note the following papers related to the considered topic (Oztop et al, 2015;Saravanan and Sivaraj, 2017;Miroshnichenko and Sheremet, 2018b;Das et al, 2018;Bondareva and Sheremet, 2017;El-Gendi, 2018;Gibanov and Sheremet, 2017;Ben-Nakhi and Chamkha, 2007;Chamkha, 2002;Ben-Nakhi and Chamkha, 2006;Chamkha HFF 28,12 and Al-Mudhaf, 2005;Sun et al, 2011;Chamkha et al, 2002;Umavathi et al, 2005). Thus, Oztop et al (2015) have analyzed natural convection heat transfer and fluid flow within different types of enclosures with local heaters, considering the working fluid as a simple fluid or a nanofluid.…”

Section: Introductionmentioning

confidence: 99%

MHD natural convection of Cu/H₂O nanofluid in a horizontal semi-cylinder with a local triangular heater

Dogonchi

Sheremet

Pop

et al. 2018

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Purpose The purpose of this study is to investigate free convection of copper-water nanofluid in an upper half of circular horizontal cylinder with a local triangular heater under the effects of uniform magnetic field and cold cylinder shell using control volume finite element method (CVFEM). Design/methodology/approach Governing equations formulated in dimensionless stream function, vorticity and temperature variables using the single-phase nanofluid model with Brinkman correlation for the effective dynamic viscosity and Hamilton and Crosser model for the effective thermal conductivity have been solved numerically by CVFEM. Findings The impacts of control parameters such as the Rayleigh number, Hartmann number, nanoparticles volume fraction, local triangular heater size, shape factor on streamlines and isotherms as well as local and average Nusselt numbers have been examined. The outcomes indicate that the average Nusselt number is an increasing function of the Rayleigh number, shape factor and nanoparticles volume fraction, while it is a decreasing function of the Hartmann number. Originality/value A complete study of the free convection of copper-water nanofluid in an upper half of circular horizontal cylinder with a local triangular heater under the effects of uniform magnetic field and cold cylinder shell using CVFEM is addressed.

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Section: Introductionmentioning

confidence: 99%

MHD natural convection of Cu/H₂O nanofluid in a horizontal semi-cylinder with a local triangular heater

Dogonchi

Sheremet

Pop

et al. 2018

HFF

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“…Considering the improved properties of nanofluids, the study of nanofluid-filled cavity starts to attract much more attention of engineers because of its enhancement in thermal transference and liquid circulation characteristics. Several works have been carried out on the free convection of nanosuspension-filled cavities with internal solid bodies (Mahmoodi, 2011; Rahmati and Tahery, 2018; Das et al , 2018; Ghalambaz et al , 2019; Raisi, 2017; Javed and Siddiqui, 2018; Sheremet and Sivaraj, 2018; Sheremet et al , 2019; Ma et al , 2019; Bondarenko et al , 2019a).…”

Section: Introductionmentioning

confidence: 99%

“…Rahmati et al (Rahmati and Tahery, 2018) studied free convective heat transfer in Titanium oxide–water nanofluid in an enclosure with hot square obstacle by using lattice boltzmann method (LBM). Das et al (Das et al , 2018) discussed natural convective heat transfer in rectangular and triangular chambers with assembly of heaters mounted on the walls. It was revealed that for low Prandtl number the heat mixing can be augmented in the case of triangular enclosures.…”

Section: Introductionmentioning

confidence: 99%

Thermal convection and entropy generation of ferrofluid in an enclosure containing a solid body

Chinnasamy¹,

Priyadharsini²,

Sheremet

2020

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Purpose This study/paper aims to deal with thermal convection and entropy production of a ferrofluid in an enclosure having an isothermally warmed solid body placed inside. It should be noted that this research deals with a development of passive cooling system for the electronic devices. Design/methodology/approach The domain of interest is a square chamber of size L including a rectangular solid block of sizes l1 and l2. Thermal convection of ferrofluid (water–Fe3O4 nanosuspension) is analyzed within this enclosure. The solid body is considered to be isothermal with temperature Th and also its area is L2/9. The vertical borders are cold with temperature Tc and the horizontal boundaries are adiabatic. The flow driven by temperature gradient in the cavity is two-dimensional. The governing equations, formulated in dimensionless primitive variables with corresponding initial and boundary conditions, are worked out by using the finite volume technique with the semi-implicit method for pressure-linked equations algorithm on a uniformly staggered mesh. The influence of nanoparticles volume fraction, aspect ratio of the solid block and an irreversibility ratio on energy transport and flow patterns are examined for the Rayleigh number Ra = 107. Findings The results show that the nanoparticles concentration augments the thermal transmission and the entropy production increases also, while the augmentation of temperature difference results in a diminution of entropy production. Finally, lower aspect ratio has the significant impact on heat transfer, isotherms, streamlines and entropy. Originality/value An efficient numerical technique has been developed to solve this problem. The originality of this work is to analyze convective energy transport and entropy generation in a chamber with internal block. To the best of the authors’ knowledge, the effects of irreversibility ratio are scrutinized for the first time. The results would benefit scientists and engineers to become familiar with the analysis of convective heat transfer and entropy production in enclosures with internal isothermal blocks, and the way to predict the heat transfer rate in advanced technical systems, in industrial sectors including transportation, power generation, chemical sectors, electronics, etc.

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“…Natural convection in the triangular container was studied extensively for various industrial applications (Joudi et al , 2004; Oztop et al , 2007; Kent et al , 2007; Oztop et al , 2012; Sun and Pop, 2014; Saha and Gu, 2015; Sojoudi et al , 2015; Rahman et al , 2017; Oztop et al , 2017; Das et al , 2018). A few works are explained next.…”

Section: Introductionmentioning

confidence: 99%

“…Oztop et al (2017) analyzed entropy generation involving unsteady free convection for one-sided open triangular container subjected to partial heating of the bottom wall. Das et al (2018) analyzed the influence of multiple solar heaters along the inclined walls on thermal management involving natural convection. It was found that the double solar heaters enhance thermal mixing.…”

Section: Introductionmentioning

confidence: 99%

Numerical heat flow visualization analysis on enhanced thermal processing for various shapes of containers during thermal convection

Lukose

Basak

2019

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Purpose The purpose of this paper is to study thermal (natural) convection in nine different containers involving the same area (area= 1 sq. unit) and identical heat input at the bottom wall (isothermal/sinusoidal heating). Containers are categorized into three classes based on geometric conﬁgurations [Class 1 (square, tilted square and parallelogram), Class 2 (trapezoidal type 1, trapezoidal type 2 and triangle) and Class 3 (convex, concave and triangle with curved hypotenuse)]. Design/methodology/approach The governing equations are solved by using the Galerkin ﬁnite element method for various processing fluids (Pr = 0.025 and 155) and Rayleigh numbers (103 ≤ Ra ≤ 105) involving nine different containers. Finite element-based heat flow visualization via heatlines has been adopted to study heat distribution at various sections. Average Nusselt number at the bottom wall ( Nub¯) and spatially average temperature (θ^) have also been calculated based on ﬁnite element basis functions. Findings Based on enhanced heating criteria (higher Nub¯ and higher θ^), the containers are preferred as follows, Class 1: square and parallelogram, Class 2: trapezoidal type 1 and trapezoidal type 2 and Class 3: convex (higher θ^) and concave (higher Nub¯). Practical implications The comparison of heat flow distributions and isotherms in nine containers gives a clear perspective for choosing appropriate containers at various process parameters (Pr and Ra). The results for current work may be useful to obtain enhancement of the thermal processing rate in various process industries. Originality/value Heatlines provide a complete understanding of heat flow path and heat distribution within nine containers. Various cold zones and thermal mixing zones have been highlighted and these zones are found to be altered with various shapes of containers. The importance of containers with curved walls for enhanced thermal processing rate is clearly established.

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Role of multiple solar heaters along the walls for the thermal management during natural convection in square and triangular cavities

Cited by 15 publications

References 44 publications

MHD natural convection of Cu/H₂O nanofluid in a horizontal semi-cylinder with a local triangular heater

MHD natural convection of Cu/H₂O nanofluid in a horizontal semi-cylinder with a local triangular heater

Thermal convection and entropy generation of ferrofluid in an enclosure containing a solid body

Numerical heat flow visualization analysis on enhanced thermal processing for various shapes of containers during thermal convection

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Role of multiple solar heaters along the walls for the thermal management during natural convection in square and triangular cavities

Cited by 15 publications

References 44 publications

MHD natural convection of Cu/H2O nanofluid in a horizontal semi-cylinder with a local triangular heater

MHD natural convection of Cu/H2O nanofluid in a horizontal semi-cylinder with a local triangular heater

Thermal convection and entropy generation of ferrofluid in an enclosure containing a solid body

Numerical heat flow visualization analysis on enhanced thermal processing for various shapes of containers during thermal convection

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Product

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MHD natural convection of Cu/H₂O nanofluid in a horizontal semi-cylinder with a local triangular heater

MHD natural convection of Cu/H₂O nanofluid in a horizontal semi-cylinder with a local triangular heater