火焔ジェットの熱伝達係数について
岩石熱破砕時の火焔ジェットのパラメータに関する研究 (第2報)
1973 年 89 巻 1029 号 p. 727-732
詳細
1973 年 89 巻 1029 号 p. 727-732
A study of thermal fracturing of rock requires a value of heat transfer coefficient of fire jet stream injected vertically to the rock: surface. In some investigations till today of thermal fracturing of rock by the fire jet, they use a equation of heat transfer coefficient for turbulent flow over a flat plate.
However, our experimental and analytical investigations of heat transfer indicated that the local heat transfer coefficient was represented by the following equation
Nux/Rex4/5·Pr1/3=0.05-0.06
and we could not use the flat-plate heat-transfer equation. The authors also showed the data of heat transfer of our air-gasoline thermodrill which was developed in our laboratory and used in piercing and cutting of rocks.
