Magnetohydrodynamic blanket scaling in a toroidal fusion reactor
Conference
·
OSTI ID:4351965
From topical meeting on technology of controlled nuclear fusion; San Diego, California, USA (16 Apr 1974). The magnetohydrodynamic scaling of a full sized blanket is investigated with a view to specifying an experimental scale model blanket, the smaller the better, that will be mnagnetohydrodynamically similar to the lithium blanket of a full sized prototype reactor. The equations of magnetohydrodynamic channel flow and heat transfer were subjected to an inspectional analysis. Of all the possible dimensionless parameters describing MHD channel flow and heat transfei- the most impontant were identified. For the present lithium blanket design they are given by: Reynolds number = 210,000, magnetic Reynolds number = 0.34 (in pumping region) and 11.34 (in field-flow aligned region), magnetic Mach number = 0.00425 (implying a Hartmann number of 63,000) and Peclet number = 4000. The properties of many liquid metals were studied as possible candidates for the scale model liquid. It was determined that either NaK 44 or NaK 78 can be used to obtain MHD similarity provided the fluids are heated to temperatures of 180 deg C and 135 deg C, respectively. if it is assumed that the magnetic field is supplied by a superconducting niobium- titanium magnet producing a field of 7.5 Tesla, the model scaie factor for NaK 44 is 1/2.77 and for NaK 78, 1/2.58. Thus the model can be about one-third the size of the full scale lithium channel. (auth)
- Research Organization:
- Oak Ridge National Lab., Tenn. (USA)
- NSA Number:
- NSA-29-025793
- OSTI ID:
- 4351965
- Report Number(s):
- CONF-740402--1
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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