Heat and Mass Transfer
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Numerical and experimental investigation of turbine blade film cooling
Heat and Mass Transfer - Tập 53 - Trang 3443-3458 - 2017
The blades in a gas turbine engine are exposed to extreme temperature levels that exceed the melting temperature of the material. Therefore, efficient cooling is a requirement for high performance of the gas turbine engine. The present study investigates film cooling by means of 3D numerical simulations using a commercial code: Fluent. Three numerical models, namely k-ε, RSM and SST turbulence mod......
Effective thermal conductivity of water-saturated sintered powder-metal plates
Heat and Mass Transfer - Tập 44 - Trang 85-99 - 2007
An experimental apparatus and related procedures for the determination of the effective thermal conductivity of sintered powder-metal plates saturated with distilled water at temperatures in the range 20–150°C are discussed. The apparatus and procedures are applied to two samples of sintered powder-metal plates, one made of nickel 200 and the other of stainless steel 316, with porosities of 28.10 ......
Influence of non-uniform flow distribution on overall heat transfer in convective bundle of circulating fluidized bed boiler
Heat and Mass Transfer - Tập 41 - Trang 981-990 - 2005
In the paper the results of comparative investigations on heat transfer performance of boiler convective bundle and its additional surface, i.e. membrane water wall are presented. For this purpose the non-uniform flow field was modelled in an isothermal test stand operated in self-modeling mode. Then the heat transfer characteristics of such arrangement were estimated by means of naphthalene heat/......
Investigation of rehydration kinetics of open-sun dried okra samples
Heat and Mass Transfer - Tập 53 - Trang 2155-2163 - 2017
In this study rehydration kinetics of open-sun dried okra, which dried naturally and two pre-treatment, was investigated at 25 and 50 °C.
By the obtained data, parameters with respect to rehydration kinetics and diffusion mechanism were calculated. In dehydration experiments, it was determined that blanching pre-treatment has influence on the drying time and okra samples were dried at 18 h. On t......
Eccentric needle displacement effect on spray formation from a multi orifice diesel injector
Heat and Mass Transfer - Tập 55 - Trang 2623-2635 - 2019
As emission regulations becomes stringent, improving injection process in internal combustion (IC) engines, is one of the ways of enhancing combustion characteristics and reducing pollutants emissions. Hence in this study, the effect of on-axis and off-axis internal needle displacement on injection characteristics from a multi orifice injector, used in direct injection IC engines, were investigate......
Heat transfer characteristics of plate heat exchanger using hybrid nanofluids: effect of nanoparticle mixture ratio
Heat and Mass Transfer - - 2020
Effect of temperature of a vertical parallel silicon solar cell under photo-thermal conditions
Heat and Mass Transfer - Tập 55 - Trang 1207-1214 - 2018
This paper aims presenting the study of the photo-thermal and behavior of the space charge region for an n + −p vertical parallel junction silicon solar cell under monochromatic illumination. It also deals with mathematical relation related to the use of new approach that involves parameter of the solar cell. The study of the base for an illumination by the rear face allowed us to determine the de......
Stationary stall phenomenon and pressure fluctuation in a centrifugal pump at partial load condition
Heat and Mass Transfer - Tập 55 - Trang 2277-2288 - 2019
Stall is a common flow phenomenon in the rotating machinery under partial load conditions. The stall phenomenon can seriously affect the operation efficiency and stability of the machinery. In the present research, the stall phenomenon in a centrifugal pump is numerically studied using the SST k-ω turbulence model. In the present work, four different flow rates (1.0 Qd, 0.7 Qd, 0.5 Qd and 0.3 Qd, ......
Natural convection liquid desiccant loop as an auxiliary air conditioning system: investigating the operational parameters
Heat and Mass Transfer - Tập 54 - Trang 903-913 - 2017
Liquid desiccant air conditioning system with natural convection was presented previously as a new generation of AC systems. The system consists of two three-fluid energy exchangers namely absorber and regenerator in which the action of air dehumidifying and desiccant regeneration is done, respectively. The influence of working parameters on system performance including the heat source and heat si......
Optimum separation of asymmetrically heated sub-channels forming a bundle: influence of simultaneous flow and temperature
Heat and Mass Transfer - Tập 32 - Trang 127-132 - 1996
This paper focuses on laminar heat and fluid flow in an array of sub-channels placed in an uniform stream, which is characterized by a fixed pressure difference and a developing velocity and temperature. The dominant feature of the study deals with the optimal selection of the plate-to-plate separation between subchannels placed in a specified volume that renders maximum heat transmission from th......
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