Abstract
To understand the distribution of temperature fields in loose rock heated by internal heat sources with constant power, two experiments under both no ventilation and negative pressure ventilation conditions were performed and the properties and geometry of the temperature fields analyzed. The results show that there is a core heating area during heating where the temperature gradient is uniform and the area encompassed by the core heating zone increases linearly as long as heat is supplied. During heating, the temperature gradient changes linearly over time. Temperature gradient under ventilation is lower than the temperature gradient under nonventilated conditions. The rock closer to the heat source has a shorter temperature response time and the greater the distance between the rock and the heat source, the greater the temperature field fluctuations. And the maximum temperature difference of 5 cm is nearly 200 °C.
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