Authors & Affiliations
Perepelitsa N.I.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
Perepelitsa N.I. – Lead Engineer. Contacts: 1, Bondarenko sq., Obninsk, Kaluga region, Russia, 249033. Tel.: +7 (484) 399-59-83;
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Abstract
The article presents the results of studies of the influence of a mobile single turbulator located in the cross section of the experimental channel on the crisis and the pressure heat exchange drop in the area of the dispersed-ring flow regime of the heat carrier. The experimental channel was a pipe with an inner diameter of 8 mm made of OH18N10T steel installed vertically on a thermophysical freon stand. Two zones of independent electric heating were created on the pipe, between which a diaphragm with a turbulator in the form of a two-sided wedge was fixed using a flange connection. The mobility of the turbulator in the form of a two-sided wedge was ensured by its location on the axis passing through its center of gravity. To assess the effect of the mobility of the two-sided wedge, it was fixed motionlessly at an angle of 0°, 27.6° and 42.4° relative to the longitudinal axis of the pipe. It is shown that the presence of oscillatory movements in the turbulator in comparison with fixing it along the pipe axis causes a positive effect on the heat due to more intensive deposition of liquid droplets on the pipe wall. An increase in the critical density of the heat flow as a percentage is significantly greater than the accompanying increase in the total pressure drop (pressure loss). The influence of the shape of the turbulator on the efficiency of heat removal intensification at the same value of the overlap coefficient of the passage section of the channel was found.
Keywords
heat exchange crisis, critical heat flux density, pressure drop, mobile turbulator, freon-12
Article Text (PDF, in Russian)
UDC 621.039.524:536.24
Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2022, no. 3, 3:19