Role of entropy generation during convective thermal processing in right-angled triangular enclosures with various wall heatings

Basak, Tanmay; Anandalakshmi, R.; Gunda, Praveen

doi:10.1016/j.cherd.2012.03.008

Cited by 21 publications

(2 citation statements)

References 56 publications

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“…The second term of Equation ( 38) involved by velocity components associated with fluid friction which is because of velocity gradient. The dimension less form of volumetric total entropy generation based on velocity-temperature and stream functionvorticity formulation (Basak et al, 2012a;Varol et al, 2008), respectively, are as follows by using dimensionless variables which have already been defined:…”

Section: Entropy Generationmentioning

confidence: 99%

A comprehensive review on natural convection flow and heat transfer

Rahimi

Saee

Kasaeipoor

et al. 2019

HFF

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Purpose The purpose of this paper is to carry out a comprehensive review of some latest studies devoted to natural convection phenomenon in the enclosures because of its significant industrial applications. Design/methodology/approach Geometries of the enclosures have considerable influences on the heat transfer which will be important in energy consumption. The most useful geometries in engineering fields are treated in this literature, and their effects on the fluid flow and heat transfer are presented. Findings A great variety of geometries included with different physical and thermal boundary conditions, heat sources and fluid/nanofluid media are analyzed. Moreover, the results of different types of methods including experimental, analytical and numerical are obtained. Different natures of natural convection phenomenon including laminar, steady-state and transient, turbulent are covered. Overall, the present review enhances the insight of researchers into choosing the best geometry for thermal process. Originality/value A comprehensive review on the most practical geometries in the industrial application is performed.

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Section: Entropy Generationmentioning

confidence: 99%

A comprehensive review on natural convection flow and heat transfer

Rahimi

Saee

Kasaeipoor

et al. 2019

HFF

View full text Add to dashboard Cite

show abstract

“…Second law analysis with entropy generation concept can be utilized to evaluate the system performance under various operating conditions [36][37][38][39][40]. The available energy destruction can be quantified by the measurement of irreversibility during a process which is called entropy generation rate.…”

Section: Introductionmentioning

confidence: 99%

Natural Convection and Entropy Generation in Nanofluid Filled Entrapped Trapezoidal Cavities under the Influence of Magnetic Field

Selimefendigil

Öztop

Abu‐Hamdeh

2016

Entropy

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Abstract:In this article, entropy generation due to natural convection in entrapped trapezoidal cavities filled with nanofluid under the influence of magnetic field was numerically investigated. The upper (lower) enclosure is filled with CuO-water (Al 2 O 3 -water) nanofluid. The top and bottom horizontal walls of the trapezoidal enclosures are maintained at constant hot temperature while other inclined walls of the enclosures are at constant cold temperature. Different combinations of Hartmann numbers are imposed on the upper and lower trapezoidal cavities. Numerical simulations are conducted for different values of Rayleigh numbers, Hartmann number and solid volume fraction of the nanofluid by using the finite element method. In the upper and lower trapezoidal cavities magnetic fields with different combinations of Hartmann numbers are imposed. It is observed that the averaged heat transfer reduction with magnetic field is more pronounced at the highest value of the Rayleigh number. When there is no magnetic field in the lower cavity, the averaged Nusselt number enhances as the value of the Hartmann number of the upper cavity increases. The heat transfer enhancement rates with nanofluids which are in the range of 10% and 12% are not affected by the presence of the magnetic field. Second law analysis of the system for various values of Hartmann number and nanoparticle volume fractions of upper and lower trapezoidal domains is performed.

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