Transverse electric-thermal-fluid instabilities in an electromagnetic heat exchanger

Article Physics, Applied

Resonance, Rayleigh flows, and thermal choking: Compressible coolant states in porous electromagnetic heat exchangers

Ajit A. Mohekar et al.

Summary: Electromagnetic heat exchangers are systems that convert electromagnetic energy into heat or mechanical work. The design requires an understanding of the coupling between temperature, electric field, and gas dynamics at the microscale level. A model predicts various phenomena such as thermal runaway and thermal choking, as well as local maxima of efficiency at specific ceramic thicknesses.

JOURNAL OF APPLIED PHYSICS (2023)

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Article Mechanics

Heat-transfer scaling at moderate Prandtl numbers in the fully rough regime

Kevin Zhong et al.

Summary: In the fully rough regime, proposed models predict a scaling for roughness heat-transfer coefficient. Direct numerical simulations of forced convection over a three-dimensional sinusoidal surface were conducted to clarify this ambiguity. The overall picture of fully rough heat transfer is not encapsulated by one singular mechanism or phenomenology, but rather an ensemble of different behaviors locally.

JOURNAL OF FLUID MECHANICS (2023)

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Article Engineering, Chemical

Computational characterization of millimetre-wave heat exchangers with an AlN:Mo susceptor of multiple cylindrical elements

Catherine M. Hogan et al.

Summary: The concept of a millimetre-wave heat exchanger with AlN:Mo ceramic composite structures as electromagnetic absorbing elements has been introduced for power beaming applications. Computational studies show that using an array of cylindrical elements can potentially increase robustness and reduce manufacturing cost, although the energy efficiency decreases slightly compared to a single cubic susceptor.

JOURNAL OF MICROWAVE POWER AND ELECTROMAGNETIC ENERGY (2022)

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Article Mechanics

Effect of inclination angle on heat transport properties in two-dimensional Rayleigh-Benard convection with smooth and rough boundaries

Krishan Chand et al.

Summary: Using direct numerical simulations, this study investigates the effect of inclination angle on heat flux, Reynolds number, and flow structures in tilted Rayleigh-Benard convection (RBC) in smooth and roughness-facilitated cells. The study finds that in smooth RBC, heat flux initially increases and then decreases with greater tilt, while in roughness-facilitated RBC, heat flux increases with greater roughness height. The study also examines the dependence of heat flux on Rayleigh number and identifies the control parameters that yield maximum heat flux in the smooth case.

JOURNAL OF FLUID MECHANICS (2022)

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Article Computer Science, Interdisciplinary Applications