Transport phenomena in a sidewall-moving bottom-heated cavity using heatlines

Biswas, Nirmalendu; Manna, Nirmal K.

doi:10.1007/s12046-016-0586-4

Cited by 20 publications

(12 citation statements)

References 58 publications

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“…In this instance, all the heat from the hot source is propagated through the centre of the cavity. These observations are similar to those obtained by Biswas and Manna [45] with the same geometrical configuration. However, concerning the effect of the Prandtl number, we observe, for the forced convection-dominated regime, that the sidewall's thermal boundary layer is thinner in the case of water than in that of air.…”

Section: Effect Of Ri and Pr On The Thermal And Flow Fieldssupporting

confidence: 92%

Prandtl Number Effects on the Entropy Generation During the Transient Mixed Convection in a Square Cavity Heated from Below

Ferroudj¹,

Köten

Kachi

et al. 2021

Period. Polytech. Mech. Eng.

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This numerical study considers the mixed convection, heat transfer and the entropy generation within a square cavity partially heated from below with moving cooled vertical sidewalls. All the other horizontal sides of the cavity are assumed adiabatic. The governing equations, in stream function–vorticity form, are discretized and solved using the finite difference method. Numerical simulations are carried out, by varying the Richardson number, to show the impact of the Prandtl number on the thermal, flow fields, and more particularly on the entropy generation. Three working fluid, generally used in practice, namely mercury (Pr = 0.0251), air (Pr = 0.7296) and water (Pr = 6.263) are investigated and compared. Predicted streamlines, isotherms, entropy generation, as well as average Nusselt numbers are presented. The obtained results reveal that the impact of the Prandtl number is relatively significant both on the heat transfer performance and on the entropy generation. The average Nusselt number increase with increasing Prandtl number. Its value varies thereabouts from 3.7 to 3.8 for mercury, from 5.5 to 13 for air and, from 12.5 to 15 for water. In addition, it is found that the total average entropy generation is significantly higher in the case of mercury (Pr«1) and water (Pr»1) than in the case of air (Pr~1). Its value varies approximately from 700 to 1100 W/m3 K for mercury, from 200 to 500 W/m3 K for water and, from 0.03 to 5 W/m3 K for air.

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Section: Effect Of Ri and Pr On The Thermal And Flow Fieldssupporting

confidence: 92%

Prandtl Number Effects on the Entropy Generation During the Transient Mixed Convection in a Square Cavity Heated from Below

Ferroudj¹,

Köten

Kachi

et al. 2021

Period. Polytech. Mech. Eng.

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“…The study concluded that aspiration can enhance the heat transfer without any extra expenses. In addition, Biswas and Manna (2017b) presented the energy transport system when a cavity is heated from the bottom wall with different combination of wall motion and thermal condition are applied.…”

Section: Introductionmentioning

confidence: 99%

Mixed Convection in Lid-Driven Cavity with Inclined Magnetic Field

Bakar

Roslan

Karimipour

et al. 2019

JSM

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Effects of magnetic field inclination on fluid flow and heat transfer in a two-dimensional square cavity are analyzed numerically. The vertical walls are well insulated, the bottom wall is maintained at a cold temperature, while the top moving lid is kept at a hot temperature. The finite volume method and SIMPLE algorithm are employed to solve the dimensionless governing equations. The results are presented by the profile of streamlines and isotherms, and the variation of Nusselt number. Mixed convection flow is retarded by the presence of the magnetic field and the average Nusselt number is an increasing function of the magnetic field angle.

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“…Of applied character, in solving the conjugated problems of hydrodynamics and thermal exchange, is the series of papers that employ a joint solution to the equations of motion and energy [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. If one examines, in the problem on a medium's motion in a cavity, the joint effect of the fields of speed, pressure, and temperature, a given problem then could be applied when the heat exchange is intensified.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…The authors established patterns in current lines, isotherms, and identified regions with the maximum and minimum energy dissipation values. Paper [15] analyzes the process of thermal stirring in a cavity from the heated bottom. The highest degree of stirring was found at the maximal speed of the lid movement among the examined ones, as well as when cooling the side wall.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Determining the structure of a laminar detachable current in an open cavity

Кravets¹

2019

EEJET

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Виконано тривимiрне чисельне розв'язання тестової задачi про течiю в'язкої нестисливої рiдини в закритiй квадратнiй кавернi з рухомою верхнею гранню. Вказано недолiки математичної постановки задачi про течiю рiдини в закритiй кавернi. Методом скiнченних елементiв проведено чисельне дослiдження структури циркуляцiйного вiдривного ламiнарного руху в'язкої нестисливої рiдини у вiдкритiй кавернi з урахуванням зовнiшньої течiї. Наведено профiлi завихоровостi, товщини пограничного шару, складових компонент швидкостi у рiзних перерiзах каверни, в пограничному шарi, а також у шарi змiшування. Зазвичай при дослiдженнi ламiнарних течiй в кавернах використовують модель каверни з рухомою стiнкою. Але використання задачi за такої постановки накладає обмеження на картину течiї у виглядi прямолiнiйної лiнiї течiї, яка з'єднує верхнi кути каверни, що призводить до невiрної структури вихороутворення в кавернi у цiлому. В рамках даного дослiдження запропоновано постановку задачi, яка долає вказаний недолiк. Рух рiдини в кавернi здiйснюється за рахунок напруження зсуву зовнiшнього потоку в каналi над каверною, що виключає прямолiнiйнiсть лiнiї течiї, яка з'єднує кутовi точки каверни. Достовiрнiсть отриманих результатiв пiдтверджена порiвнянням деяких параметрiв з вiдомими експериментальними даними iнших авторiв. Отриманий науковий результат у виглядi структури вихороутворення в'язкого нестисливого ламiнарного потоку у вiдкритiй кавернi з каналом є цiкавим з теоретичної точки зору. З практичної точки зору виявлена структура течiї дозволяє визначити умови керування потоком в кавернi, i, отже, дозволяє визначити умови оптимiзацiї аеродинамiчних сил, дiючих на каверну. Прикладним аспектом використання отриманого наукового результату є можливiсть застосування його до обтiкання об'єктiв промисловостi: будiвель, мiжвагонного простору залiзничного потяга та iн. Ключовi слова: вiдрив потоку, ламiнарний режим, течiя в кавернi, чисельне моделювання, структура вихороутворення

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Transport phenomena in a sidewall-moving bottom-heated cavity using heatlines

Cited by 20 publications

References 58 publications

Prandtl Number Effects on the Entropy Generation During the Transient Mixed Convection in a Square Cavity Heated from Below

Prandtl Number Effects on the Entropy Generation During the Transient Mixed Convection in a Square Cavity Heated from Below

Mixed Convection in Lid-Driven Cavity with Inclined Magnetic Field

Determining the structure of a laminar detachable current in an open cavity

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