Dissertation
Dissertation > Industrial Technology > Mining Engineering > Mine safety and labor protection > Mine ventilation > Ventilation design and air flow,the drag calculation

Calculation Method of Heat-transfer Coefficient in Working Face with Auxiliary Ventilation

Author ZhangYanLi
Tutor GaoJianLiang
School Henan Polytechnic University
Course Mining Engineering
Keywords Local exhaust ventilation Merry speed Numerical Simulation Heat transfer coefficient
CLC TD722
Type Master's thesis
Year 2010
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With the increasing depth of coal mining , the heat injury problem is getting worse . To effectively combat heat harmful necessary to accurately predict the distribution of the thermal environment of the mine , the airflow temperature distribution directly affect the heat exchange between the rock surface and the airflow and , therefore, it is necessary to calculate airflow temperature downhole Face . Heading Face the local ventilation airflow temperature calculated especially need to know the the heading face the heat transfer coefficient and the heat transfer coefficient with the airflow speed . Usually the use of computational fluid dynamics software FLUENT solver to simulate the flow field on the tunneling face , to get the the heading face the Merry velocity distribution . Analog solver heading face velocity field , the general use of the wall function method to solving the flow field near the wall , the wall function requires the first layer next to the wall of the nodes in the logarithmic . Generally the first layer meshing grid node-to- wall distance are equal , as local ventilation Heading Face wind speed distribution is very uneven , so let the first layer of nodes in for LIL layer is impossible . In this paper, the calculation of the flow field of different near-wall grid spacing to determine the distance of the first layer of mesh nodes selected , heading face flow field close to the actual situation , to get of Heading Face romantic velocity field . By wall temperature operator heading face flow field solution under isothermal conditions , the heading face temperature distribution, according to the heat of the roadway and Merry exchange theory , combined with local ventilation the heading face Merry speed distribution , heading face no distribution of the dimensionless heat transfer coefficient .

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