Average Heat Transfer Coefficient in the Circular Model Airway Having Ring Type Roughness Elements with Semicircular Cross-section

Yoshizawa, Yukio; Kawashima, T.; Kiyohashi, Hiroshi

doi:10.2473/shigentosozai1953.87.994_11

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“…Here it is supposed that the ratio of local heat transfer coefficient to 0 is independent of the roughness of the roadway surface. Then the following formula can be driven: rough surface of an airway with through airflow have been studied by many researchers (Yoshizawa et al, 1971(Yoshizawa et al, , 1975Danko and Cifka, 1984), which can be used to decide the value of R . Consequently, the distribution of local heat transfer coefficient F on rough surface of working face with auxiliary ventilation can be calculated from equation (6).…”

Section: ・3 Heat Transfer Coefficient On Rough Surface In Working Facementioning

confidence: 99%

Prediction of Climatic Conditions in Developing Roadway with Forcing Auxiliary Ventilation System. Control of thermal environmental conditions in locally ventilated working place. (2nd Report).

Gao¹,

建良²,

健一

et al. 2002

Shigen-to-Sozai

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and Masatomo ICHINOSE 4 Finite difference method is applied to simulate the thermal environmental conditions in a developing roadway with forcing auxiliary ventilation. The local heat transfer coefficients which were obtained by simulating the heat and mass transfer process in working face with CFD method are coded into the program for the prediction of the thermal environmental conditions in working face. The 3-demensional heat conduction in surrounding strata rock, the heat and mass transfer between the airflow in the duct and roadway, the heat and mass transfer between wet rock surface and roadway air are simulated with taking into consideration the air leakage of the ventilation duct and the advance of the working face. The distribution of the air temperature and relative humidity of the air both in the duct and roadway, and their variation with time can be predicted by the program when forcing auxiliary ventilation is used. The model for the prediction of the thermal environment can provide a reliable approach to predict if a climate problem exists in the design stage, allowing suitable ameliorative measures to be tested and evaluated prior to the start of driving. It will contribute to establishing the rational method for improvement of the thermal environment, by proposing more effective technological guide in the control of heat problems in working face with auxiliary ventilation.

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Section: ・3 Heat Transfer Coefficient On Rough Surface In Working Facementioning

confidence: 99%

Prediction of Climatic Conditions in Developing Roadway with Forcing Auxiliary Ventilation System. Control of thermal environmental conditions in locally ventilated working place. (2nd Report).

Gao¹,

建良²,

健一

et al. 2002

Shigen-to-Sozai

View full text Add to dashboard Cite

show abstract

Average Heat Transfer Coefficient in the Circular Model Airway Having Ring Type Roughness Elements with Semicircular Cross-section

Cited by 1 publication

References 0 publications

Prediction of Climatic Conditions in Developing Roadway with Forcing Auxiliary Ventilation System. Control of thermal environmental conditions in locally ventilated working place. (2nd Report).

Prediction of Climatic Conditions in Developing Roadway with Forcing Auxiliary Ventilation System. Control of thermal environmental conditions in locally ventilated working place. (2nd Report).

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