Entropy generation and natural convection flow of a suspension containing nano-encapsulated phase change particles in a semi-annular cavity

Ghalambaz, Mehdi; Mehryan, S.A.M.; Mozaffari, Masoud; Hajjar, Ahmad; Kadri, Mohamad El; Rachedi, Nesrine; Sheremet, Mikhail А.; Younis, Obai; Nadeem, Sohail

doi:10.1016/j.est.2020.101834

Cited by 21 publications

(6 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hatami et al (2016) explored the effects of amplitudes and numbers of the waviness of a heated curved wall on buoyant convection using nanofluid flow and reported enhanced heat transfer for higher amplitudes and numbers of the waviness. Ghalambaz et al (2020) explored the thermal behavior of a semi-annular oblique cavity filled with nano-enhanced phase-change material and found that optimum thermal behavior is achieved with the inclination of the cavity.…”

Section: Introductionmentioning

confidence: 99%

Hybridized nanofluidic convection in umbrella-shaped porous thermal systems with identical heating and cooling surfaces

Biswas

Mandal²,

Manna

et al. 2023

HFF

View full text Add to dashboard Cite

Purpose This study aims to investigate the impact of different heater geometries (flat, rectangular, semi-elliptical and triangular) on hybrid nanofluidic (Cu–Al2O3–H2O) convection in novel umbrella-shaped porous thermal systems. The system is top-cooled, and the identical heater surfaces are provided centrally at the bottom to identify the most enhanced configuration. Design/methodology/approach The thermal-fluid flow analysis is performed using a finite volume-based indigenous code, solving the nonlinear coupled transport equations with the Darcy number (10–5 ≤ Da ≤ 10–1), modified Rayleigh number (10 ≤ Ram ≤ 104) and Hartmann number (0 ≤ Ha ≤ 70) as the dimensionless operating parameters. The semi-implicit method for pressure linked equations algorithm is used to solve the discretized transport equations over staggered nonuniform meshes. Findings The study demonstrates that altering the heater surface geometry improves heat transfer by up to 224% compared with a flat surface configuration. The triangular-shaped heating surface is the most effective in enhancing both heat transfer and flow strength. In general, flow strength and heat transfer increase with rising Ram and decrease with increasing Da and Ha. The study also proposes a mathematical correlation to predict thermal characteristics by integrating all geometric and flow control variables. Research limitations/implications The present concept can be extended to further explore thermal performance with different curvature effects, orientations, boundary conditions, etc., numerically or experimentally. Practical implications The present geometry configurations can be applied in various engineering applications such as heat exchangers, crystallization, micro-electronic devices, energy storage systems, mixing processes, food processing and different biomedical systems (blood flow control, cancer treatment, medical equipment, targeted drug delivery, etc.). Originality/value This investigation contributes by exploring the effect of various geometric shapes of the heated bottom on the hydromagnetic convection of Cu–Al2O3–H2O hybrid nanofluid flow in a complex umbrella-shaped porous thermal system involving curved surfaces and multiphysical conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

Hybridized nanofluidic convection in umbrella-shaped porous thermal systems with identical heating and cooling surfaces

Biswas

Mandal²,

Manna

et al. 2023

HFF

View full text Add to dashboard Cite

show abstract

“…They concluded that internal heat production or absorption and hybrid nanofluid affect the heat transfer rate and entropy production within the annulus. Entropy production and free convection flow of a suspension containing nano-encapsulated phase change materials (NEPCM) in a semi-annular cavity are examined by Ghalambaz et al 48 They observed that NEPCM particles enhance heat transfer, and the optimum phase change temperature is a function of the enclosure's tilting angle. Alsabery et al 49 studied entropy analysis of nanofluids under unsteady conditions, which are placed inside a cubic porous container with a wavy bottom wall.…”

Section: Introductionmentioning

confidence: 99%

Entropy production analysis and cooling time calculation for an open hemispherical cavity in natural convection

Behera

Chandrakar

Mukherjee

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

View full text Add to dashboard Cite

A numerical investigation of natural convection from an open hemispherical cavity is conducted in this study. The entropy production analysis and estimation of cooling time is the prime objective here. The study is conducted for different Rayleigh numbers [Formula: see text], the surface temperatures (350–550 K) and radius of curvature ratios of the hemisphere vary from 1 to 5. The problem is simulated in ANSYS Fluent 19. The perspective of both the first and second thermodynamic law is included in the modified function ( I/Q) to make the analysis. Entropy production because of fluid friction and heat transfer and corresponding irreversibilities are calculated, and obtained results are compared with the thermo-fluid behavior of the problem. The heat transfer enhances with an increment in the curvature radius and Rayleigh number for the given temperature. Also, entropy production, mainly contributed by heat transfer and fluid friction, has a lesser contribution. When the non-dimensional radius rises from 1 to 5, the dimensionless heat transfer increases from 5 to 24.05, almost five times for Ra = 103 and T* = 1.67. The entropy generation grows from 0.0011 to 0.0147 W/K when the non-dimensional temperature rises from 1.17 to 1.67 for R* = 5 and Ra = 103. A similar observation for Ra = 107 is noticed. With an increase in non-dimensional radius, the entropy generation rate increases up to five times. Moreover, the induced heat transfer irreversibility rises with the curvature radius, whereas fluid friction irreversibility reduces. The cooling time of the body is computed using lumped capacitance method.

show abstract

“…Their study ascertained a growth in NEPCMs's melting range could lead to an enhancement in the Nu. Ghalambaz et al [22] inspected the EG for a natural convection of NEPCMs inside a semi-annular container. They revealed the heat transfer may boost by existence of the particles of NEPCMs.…”

Section: Introductionmentioning

confidence: 99%

Dissection of entropy production for the free convection of NEPCMs-filled porous wavy enclosure subject to volumetric heat source/sink

Afshar

Mishra

Dogonchi³

et al. 2021

Journal of the Taiwan Institute of Chemical Engineers

116

View full text Add to dashboard Cite

Entropy generation and natural convection flow of a suspension containing nano-encapsulated phase change particles in a semi-annular cavity

Cited by 21 publications

References 40 publications

Hybridized nanofluidic convection in umbrella-shaped porous thermal systems with identical heating and cooling surfaces

Hybridized nanofluidic convection in umbrella-shaped porous thermal systems with identical heating and cooling surfaces

Entropy production analysis and cooling time calculation for an open hemispherical cavity in natural convection

Dissection of entropy production for the free convection of NEPCMs-filled porous wavy enclosure subject to volumetric heat source/sink

Contact Info

Product

Resources

About