Kyushu University · Engineering
Professor Akio Miyara's research lab specializes in experimental and numerical investigations of heat transfer and fluid dynamics in advanced thermal systems, with a focus on phase change phenomena, refrigerant behavior, and fluid properties under industrial conditions. The lab conducts detailed studies on condensation heat transfer, viscosity measurements of environmentally friendly refrigerants, and pressure drop characteristics in microfin and smooth tubes, particularly for applications in high-efficiency heat pumps and organic Rankine cycles. Their work combines precise experimental techniques with advanced numerical modeling to support the design and optimization of sustainable thermal energy systems.
Figures are computed from collected data and may differ slightly.
Wave evolution and heat transfer behavior of a wavy condensate film down a vertical wall have been investigated by a finite difference method, in which the algorithm is based on the HSMAC method, and a staggered grid fixed on a physical space is employed. For the moving interface, newly proposed methods are used. A random perturbation of the film thickness is generated near the leading edge. The perturbation quickly diminishes once and small-amplitude long waves are propagated downstream. Then t
The principal goals of the present work are to measure the viscosity of vapor and liquid cis-1,1,1,4,4,4-hexafluoro-2-butene (R-1336mzz(Z)) and propose simplified correlations of the extracted data under saturation conditions for industrial design and simulation. R-1336mzz(Z), a hydro-fluoro-olefin with a low global warming potential and attractive environmental properties, can be considered as a potential working fluid for high-temperature heat pumps and organic Rankine cycles. Nevertheless, re
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