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Numerical study of the influence of the atmospheric pressure on the thermal environment in the passenger cabin

Building Simulation 2024年第2期17卷 253-265页

作者： Xin Su Yu Guo Zhengwei Long Yi Cao Tianjin Key Lab.of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin UniversityTianjin300072China Shanghai Aircraft Design and Research Institute Jinke RoadPudong DistrictShanghai201210China

The cabin air pressure remains lower than the horizontal atmospheric pressure when the airplane is in *** pressure is one of the parameters that must be taken into consideration while studying the thermal environment of an airplane *** are still no reference values for aircraft cabins despite the fact that numerous studies on low pressure heat transfer have demonstrated the connection between convective heat transfer coefficient(CHTC)and air *** this paper,a correction method for CHTC under low pressure conditions was established by using the dummy heat dissipation in the low-pressure cabin *** this basis,a thermal environment simulation model was developed,then was applied to the simulation of a seven-row aircraft cabin containing 42 passengers,and the CHTC and heat loss of dummy surface in the cabin were ***,the results of PMV calculated by using heat dissipation and air parameters at sampling points were *** results show that the modified CHTC can accurately reflect the cabin thermal environment under low pressure conditions,and the correction of CHTC can be realized by adjusting the turbulent Prandtl number,which is nonlinear correlated with the *** simulation results of the thermal environment in the seven-row cabin show that the CHTC changes by about 42%before and after *** air pressure decreases during take-off,which reduces the average CHTC of the crew surface from 5.09 W/(m^(2)·K)to 4.56 W/(m^(2)·K),but the air temperature rises by about 0.2°C as a *** deviation of PMV results calculated by using simulated heat loss data and using air parameters of measuring points in space is up to 0.5,but the latter is representative for calculating the thermal comfort level of the whole cabin.

关键词： low pressure aircraft cabin simulation heat dissipation convective heat transfer coefficient

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Experimental Study and Thermal Modelling of Cocoa Shell convective Drying in an Indirect Solar Dryer

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Modeling and Numerical Simulation of Material Science 2024年第2期14卷 69-78页

作者： Siaka Touré Adjo Christelle Ogo Modibo Sidibé Solar Energy Laboratory FHB University of Cocody Abidjan C&#244te d’Ivoire

The concern of the present work is the convective drying of empty cocoa shells in an indirect solar dryer. Some drying experiments, using one sample, were carried out. During the experiments, the sample is introduced in the drying chamber. Then at steady time intervals, the sample is withdrawn from the drying chamber, for a rapid weighing. After each weighing, the sample is reintroduced in the dryer. At each time interval, the ambient temperature of the drying chamber and its relative humidity γ are measured by a thermo-hygrometer. From the experimental data, a theoretical determination of the moisture evaporated from the product was performed and a good agreement was found between the theoretical and experimental values, confirmed by the value of the RMSE. Those calculations used the constants in the Nusselt number found in literature. Then those constants were evaluated again, to get new values more suitable with the experimental data. The dimensionless numbers of Nusselt, Grashof and Prandtl were calculated. That allowed the calculation of the average value of the Nusselt number. The average convective heat transfer coefficient was determined.

关键词： Shells of Cocoa Pods Indirect Solar Dryer Moisture Evaporated Constants of the Nusselt Number convective heat transfer coefficient

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Immersed liquid cooling Nd:YAG slab laser oscillator

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Chinese Optics Letters 2023年第8期21卷 48-54页

作者：叶志斌周小龙江舒黄萌吴飞雷冬阁 College of Electrical and Information Engineering Quzhou UniversityQuzhou 324000China

An immersed liquid cooling slab laser is demonstrated with deionized water as the coolant and a Nd:YAG slab as the gain *** waveguides,a highly uniform pump beam distribution is achieved,and the flow velocity distribution is also optimized in the channels of the gain module(GM).At various flow velocities,the convective heat transfer coefficient(CHTC)is ***,a maximum output power of 434 W is obtained with an optical–optical efficiency of 27.1%and a slope efficiency of 36.6%.To the best of our knowledge,it is the highest output power of an immersed liquid cooling laser oscillator with a single Nd:YAG slab.

关键词： liquid cooling slab laser oscillator convective heat transfer coefficient

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COMPLEX heat transfer ENHANCEMENT BY FLUID INDUCED VIBRATION

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Journal of Hydrodynamics 2003年第1期15卷 84-89页

作者： Cheng Lin, Qiu YanSchool of Energy Source and Power Engineering, Shandong University, Jinan 250061, China School of Energy Source and Power Engineering Shandong University Jinan 250061 China

A new method of heat transfer enhancement by fluid induced vibration was putforward, and its theoretical a-nalysis and experimental study were performed. Though people alwaystry to prophylaxis fluid induced vibration for regarding it as an accident, the utilization space offluid induced vibration is still very large. The in-surface and out-surface vibrations which comefrom the fluid induce elastic tube bundles, can effectively increase the convective heat transfercoefficient, and also decrease the fouling resistance, then increase the heat transfer coefficientremarkably.

关键词： elastic tube bundles fluid induced vibration fouling resistance convective heat transfer coefficient

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