scholarly journals Computational modelling of the heat transfer through two-layer woven structure ensembles

2020 ◽  
Vol 71 (04) ◽  
pp. 393-397
Author(s):  
ANGELOVA A.RADOSTINA ◽  
MIROSLAV KYOSOV ◽  
PETER STANKOV
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Indoor Air ◽  
Software Package ◽  
Computational Modelling ◽  
Cross Flow ◽  
The Body ◽  
Novel Approach ◽  
Woven Structure ◽  
Indoor Conditions

The purpose of the present study was to investigate the heat transfer through a system of two consecutive textile layers with woven macrostructures by numerical simulation, using FLUENT CFD software package. A novel approach for modelling of the textile structure was applied, based on jet systems. The heat transfer through the systems of layers was studied for indoor conditions, simulating skin and indoor air temperature, as well as the effect of the convective cross flow around the human body. The results of the study showed that the heat transfer through a system of two layers is strongly influenced by the porosity and thickness of the fabrics, as well as their arrangement in the systems as an insulating barrier between the body and the environment.

scholarly journals Computational modelling of the heat transfer through two-layer woven structure ensembles

2020 ◽  
Vol 71 (04) ◽  
pp. 393-397
Author(s):  
ANGELOVA A. RADOSTINA ◽  
MIROSLAV KYOSOV ◽  
PETER STANKOV
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Indoor Air ◽  
Software Package ◽  
Computational Modelling ◽  
Cross Flow ◽  
The Body ◽  
Novel Approach ◽  
Woven Structure ◽  
Indoor Conditions

The purpose of the present study was to investigate the heat transfer through a system of two consecutive textile layers with woven macrostructures by numerical simulation, using FLUENT CFD software package. A novel approach for modelling of the textile structure was applied, based on jet systems. The heat transfer through the systems of layers was studied for indoor conditions, simulating skin and indoor air temperature, as well as the effect of the convective cross flow around the human body. The results of the study showed that the heat transfer through a system of two layers is strongly influenced by the porosity and thickness of the fabrics, as well as their arrangement in the systems as an insulating barrier between the body and the environment.

scholarly journals Performance analysis of new structure heat exchanger based on field synergy and numerical simulation

2021 ◽  
Vol 260 ◽  
pp. 01019
Author(s):  
Xinpu Song ◽  
Feng Zhang ◽  
Jin Yu ◽  
Dongsheng Xi ◽  
Mengdi Chen
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Exchanger ◽  
High Efficiency ◽  
Cross Flow ◽  
Transfer Model ◽  
Field Synergy ◽  
Coupled Heat Transfer ◽  
Heat Transfer Efficiency ◽  
Important Means

High efficiency heat exchanger is always a hot topic, and field synergy theory is introduced as an important means to optimize the heat transfer efficiency. Based on the field synergy theory, a new type of heat exchanger is proposed in this paper, in which, the cold and hot fluid presents reverse cross flow law. Through the verification of the test and numerical simulation results, a reasonable numerical simulation model and method are obtained. Then, the flow and heat transfer conditions of the new structure heat exchanger are simulated by the verified numerical simulation technology. The conclusion is as follows: K-ε turbulence model and coupled heat transfer model can be effectively used in the numerical simulation of heat exchanger. And the reverse cross convection heat exchanger can effectively improve the uniformity of water temperature distribution in the heat exchanger.

Numerical Simulation of Body Heat Transfer Coefficient Test of a Railway Vehicle

2011 ◽  
Vol 291-294 ◽  
pp. 1713-1721
Author(s):  
Jian Bin Zang ◽  
Ming Wei Cai ◽  
Nai Ping Gao
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Cross Sections ◽  
High Speed ◽  
Mean Value ◽  
The Body ◽  
Railway Vehicle ◽  
Body Heat

The body heat transfer coefficient of a railway vehicle is an essential parameter for designing vehicle. The proposed method in this paper could be used to simulate the test conditions of body heat transfer coefficient of a railway vehicle. The simulated object was a middle of high speed train and the numerical simulation was two-dimensional due to the limitation of RAM capacity of PC computers. Simulation results with five different meshing showed body heat transfer coefficient was affected greatly by the amount of grids. Existence of thermal bridge would increase body heat transfer coefficient significantly, which was concluded by the simulation of two models. Three typical cross sections of a middle were used for simulation of the body heat transfer coefficient and the weighted mean value was 1.30 W/m2•K. The difference was only 7% compared with the actual test value of 1.215 W/m2•K, which indicated the advantage of this method.

scholarly journals Free Software Package SIGMA_FW for Numerical Simulation of Hydrodynamics and Heat Transfer

2017 ◽  
Vol 10 (4) ◽  
pp. 534-542
Author(s):  
Alexander A. Dekterev ◽  
◽  
Kirill Yu. Litvintsev ◽  
Andrey A. Gavrilov ◽  
Egor B. Kharlamov ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Software Package ◽  
Free Software

scholarly journals Simulating the physiology of athletes during endurance sports events: modelling human energy conversion and metabolism

2011 ◽  
Vol 369 (1954) ◽  
pp. 4295-4315 ◽  
Author(s):  
Johannes H. G. M. van Beek ◽  
Farahaniza Supandi ◽  
Anand K. Gavai ◽  
Albert A. de Graaf ◽  
Thomas W. Binsl ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Energy Metabolism ◽  
Energy Conversion ◽  
Computational Modelling ◽  
The Body ◽  
Metabolic Energy ◽  
Whole Body ◽  
Endurance Sports ◽  
Sports Events ◽  
The Brain

The human physiological system is stressed to its limits during endurance sports competition events. We describe a whole body computational model for energy conversion during bicycle racing. About 23 per cent of the metabolic energy is used for muscle work, the rest is converted to heat. We calculated heat transfer by conduction and blood flow inside the body, and heat transfer from the skin by radiation, convection and sweat evaporation, resulting in temperature changes in 25 body compartments. We simulated a mountain time trial to Alpe d'Huez during the Tour de France. To approach the time realized by Lance Armstrong in 2004, very high oxygen uptake must be sustained by the simulated cyclist. Temperature was predicted to reach 39 ° C in the brain, and 39.7 ° C in leg muscle. In addition to the macroscopic simulation, we analysed the buffering of bursts of high adenosine triphosphate hydrolysis by creatine kinase during cyclical muscle activity at the biochemical pathway level. To investigate the low oxygen to carbohydrate ratio for the brain, which takes up lactate during exercise, we calculated the flux distribution in cerebral energy metabolism. Computational modelling of the human body, describing heat exchange and energy metabolism, makes simulation of endurance sports events feasible.

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