CHARACTERISTICS OF HEAT TRANSFER IN MHD FLOW OF LIQUID METAL IN A TUBE-IN-CHANNEL HEAT-EXCHANGE SYSTEM

The authors have conducted experimental investigations of heat transfer in upward fl ow of liquid metal in a vertical
tube passing along the axis of a square heated channel incorporated in the contour of a natural-circulation loop.
The measurements were carried out in the absence and in the presence of a transverse magnetic fi eld. Use was made
of probing measurement procedures with longitudinal microthermocouple probes in both the tube and the channel.
Consideration has been given to three basic regimes of cooling in upward fl ow of mercury in the tube and its natural
convective fl ow in the interchannel gap when the loop is shut off and when the loop is open without cooling and with
cooling. For the cases of uniform heating of the channel in regimes with variable Reynolds and Hartmann numbers,
the authors obtained the profi les of averaged temperature, the distributions of local heat-transfer coeffi cients, and
the pulsation characteristics of temperature in the fl ows in the tube and in the channel gap. It has been found that the
confi guration of fl ow and its structure in the gap change substantially upon applying the transverse magnetic fi eld,
and also depending on the operating regime of the natural-circulation loop.
The authors have conducted experimental investigations of heat transfer in upward fl ow of liquid metal in a vertical
tube passing along the axis of a square heated channel incorporated in the contour of a natural-circulation loop.
The measurements were carried out in the absence and in the presence of a transverse magnetic fi eld. Use was made
of probing measurement procedures with longitudinal microthermocouple probes in both the tube and the channel.
Consideration has been given to three basic regimes of cooling in upward fl ow of mercury in the tube and its natural
convective fl ow in the interchannel gap when the loop is shut off and when the loop is open without cooling and with
cooling. For the cases of uniform heating of the channel in regimes with variable Reynolds and Hartmann numbers,
the authors obtained the profi les of averaged temperature, the distributions of local heat-transfer coeffi cients, and
the pulsation characteristics of temperature in the fl ows in the tube and in the channel gap. It has been found that the
confi guration of fl ow and its structure in the gap change substantially upon applying the transverse magnetic fi eld,
and also depending on the operating regime of the natural-circulation loop.
Author:  N. A. Luchinkin, N. G. Razuvanov, and O. N. Polyanskaya
Keywords:  liquid metals, hydrodynamics, heat transfer, magnetic fi eld, thermogravitational convection
Page:  438