☆ 4.8 Review

Convection heat transfer in enclosures with inner bodies: A review on single and two-phase nanofluid models

RENEWABLE & SUSTAINABLE ENERGY REVIEWS (2023)

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Summary: This study investigates the transient analysis of thermal response and frictional loss characteristics for flow-modulated conjugate heat transfer phenomena. It explores the effects of different blade configurations on heat transfer and power loss in the flow domain. The results show that increasing the number of blades has a negligible impact on the heat transfer rate, and the three-blade modulator exhibits the lowest power loss coefficient and power instability.

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Summary: This study is a systematic review that comprehensively analyzes the heat transfer performance in different kinds of cavities. It investigates the effects of various forces and different types of fluids on heat transfer in cavities. The review also covers validation techniques and mesh types used in numerical studies. The study examines 297 research articles and highlights the significant impact of obstacles and the use of nanofluids on enhancing heat transfer in cavities. Additionally, it suggests future research directions in this field and discusses the implications of the findings in various applications.

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Entropy generation minimization EGM analysis of free convective hybrid nanofluid flow in a corrugated triangular annulus with a central triangular heater

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Summary: Entropy production always accompanies heat transfer phenomena, leading to the destruction of available work and energy resources. This study focuses on minimizing valuable energy resources in convective heat transfer augmentation situations by reducing temperature differences and entropy generation. An optimal thermal design for augmented free convective situations is analyzed, considering a hybrid nanofluid flow in a corrugated triangular annulus heated by an underneath partial heater. Three approaches, including corrugated walls, inner heater at lower nonuniform temperature, and magnetic field effects, are applied to reduce entropy production. Numerical solutions are obtained using the finite element method, and the validity of the results is confirmed through comparison with previously published investigations. The study highlights the influential role of the thermal design in reducing entropy production, attributed to the higher thermal conductivity of the hybrid nanofluid. It is found that maintaining the inner triangular body at a temperature lower than the bottom heat source significantly reduces overall entropy, and corrugated walls minimize entropy more effectively than flat walls.

CHINESE JOURNAL OF PHYSICS (2022)

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Review Chemistry, Physical

Synthesis, stability, thermophysical properties and heat transfer applications of nanofluid-A review

Bhavin Mehta et al.

Summary: Nanofluid, with its excellent thermophysical properties, is highly suitable for heat transfer applications. The stability of nanofluid plays a crucial role in enhancing its thermophysical properties. Various parameters such as base fluid type, nanoparticle type, surfactant type, and preparation method affect the stability of nanofluid. This article provides a comprehensive review of synthesis techniques, stability evaluation, enhancement techniques, and the impact of parameters on thermophysical properties of nanofluid. The article also discusses the suitability of nanofluid in different heat transfer applications and includes an economic analysis.

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Effects of temperature-dependent viscosity on natural convection in a porous cavity with a circular cylinder under local thermal non-equilibrium condition

Lei Wang et al.

Summary: In this study, the influences of exponentially temperature-dependent viscosity on free convection in a porous cavity with a circular cylinder under local thermal non-equilibrium condition are numerically investigated using lattice Boltzmann method. The results show that an increase in LTNE parameters leads to a dramatic increase in solid heat transfer rate, while higher values of n result in decreased heat transfer rates for both fluid and solid phases.

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Instability characteristics of a highly separated natural convection flow: Configuration of a tandem of cold and hot horizontally oriented cylinders placed within a cold cubic enclosure

Efi Zemach et al.

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INTERNATIONAL JOURNAL OF THERMAL SCIENCES (2021)

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ISPH simulations of natural convection from rotating circular cylinders inside a horizontal wavy cavity filled with a nanofluid and saturated by a heterogeneous porous medium

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EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS (2021)

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Numerical simulation of mixed convection flow and heat transfer in the lid-driven triangular cavity with different obstacle configurations

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INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER (2021)

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Periodic unsteady natural convection in square enclosure induced by inner circular cylinder with different vertical locations

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Summary: The numerical study investigates the periodic unsteady natural convection flow and heat transfer in a square enclosure with a heated circular cylinder at different vertical locations. Results show that heat transfer significantly depends on the vertical location and pulsating temperature of the inner cylinder. Comparing with steady state natural convection, heat transfer is generally enhanced for time-periodic unsteady natural convection, with local maximum heat transfer rates observed at certain locations. The phenomenon of backward heat transfer is discussed, with the quantity of back heat transfer rate presented.

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER (2021)

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Natural convection in an L-shape cavity equipped with heating blocks and

Hazim Moria

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INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER (2021)

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T. R. Vijaybabu

Summary: The study analyzes the effects of porous circular cylinder and magnetic field on double-diffusive natural convection and entropy generation in an enclosure using lattice Boltzmann method. Results show that increasing Da, BR, and gamma(M) improves heat and concentration transfers, while increasing permeability significantly enhances flow-field intensity around the cylinder. The influence of Ha on Nusselt and Sherwood numbers can be controlled by the direction of the magnetic field.

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Numerical investigation of transient mixed convection of nanofluid in a cavity with non-Darcy porous inner block and rotating cylinders with harmonic motion

Nima Shirani et al.

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Effect of heat generation and heat absorption on natural convection of Cu-water nanofluid in a wavy enclosure under magnetic field

Ammar Abdulkadhim et al.

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INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER (2021)

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Immersed boundary method for MHD unsteady natural convection around a hot elliptical cylinder in a cold rhombus enclosure filled with a nanofluid

Ali Akbar Hosseinjani et al.

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Characteristics of thermal convection in a rectangular channel with an inner cold circular cylinder

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Transitions of natural convection flows in a square enclosure with a heated circular cylinder

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MHD mixed convection in a lid-driven cavity including heat conducting circular solid object and corner heaters with Joule heating

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Natural convection experiments on a heated horizontal cylinder in a differentially heated square cavity

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Laminar mixed convection flow and heat transfer characteristics in a lid driven cavity with a circular cylinder

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Bifurcation to unsteady natural convection in square enclosure with a circular cylinder at Rayleigh number of 107

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Natural convection in square enclosure with hot and cold cylinders at different vertical locations

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Lattice Boltzmann simulation of natural convection around a horizontal elliptic cylinder inside a square enclosure

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Natural convection for large temperature gradients around a square solid body within a rectangular cavity

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Lattice Boltzmann method applied to the laminar natural convection in an enclosure with a heat-generating cylinder conducting body

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Numerical simulation of natural convection in a horizontal enclosure with a heat-generating conducting body

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Two-dimensional and unsteady natural convection in a horizontal enclosure with a square body

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