ISSN Online: 2377-424X
ISBN CD: 1-56700-226-9
ISBN Online: 1-56700-225-0
International Heat Transfer Conference 13
EXPERIMENTAL INVESTIGATION OF OPEN LOOP TWO PHASE THERMOSYPHON IN NARROW VERTICAL CHANNEL
摘要
In the present work, an experimental investigation is presented to evaluate the effectiveness of the boiling at the bottom of MTR fuel element of pool type reactors as a cooling mechanism to the uncovered zone, in a case of a partial Loss Of Coolant Accident (LOCA). The experiments were performed by using electrically heated test section. The dimensions of the channel cross section were 2 × 60 mm and 600 mm in high. The test section immersed in a water pool in a vertical direction and the level of the water was a half of the test channel high (300 mm). The test section walls were heated in a various channel power and the wall temperature was measured.
It was found that in a low power level of about 130 W the boiling in the immersed part of the channel is very poor causing a low heat transfer coefficient and a high wall temperature. When the channel power was higher (about 250 W) the boiling at the immersed zone was more intensive causing a slug flow at the exposed zone of the channel and the wall temperature reduced to the saturation temperature. The experiments carried out until a channel power of about 2.2 kW without reaching any critical wall temperature.
It was found that in a low power level of about 130 W the boiling in the immersed part of the channel is very poor causing a low heat transfer coefficient and a high wall temperature. When the channel power was higher (about 250 W) the boiling at the immersed zone was more intensive causing a slug flow at the exposed zone of the channel and the wall temperature reduced to the saturation temperature. The experiments carried out until a channel power of about 2.2 kW without reaching any critical wall temperature.