Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

International Heat Transfer Conference 13
August, 13-18, 2006, Sydney, Australia

APPLICATION OF MULTIPLE MAGNETIC COILS TO DRIVE THE AIR FLOW IN A LONG PIPE

Get access (open in a dialog) DOI: 10.1615/IHTC13.p20.100
9 pages

Abstrakt

Magnetically driven air flow rate in a pipe is numerically computed with a pipe partly heated from a tube wall and with an application of a strong magnetic field, which is called as a magneto-thermal wind tunnel. Simulation is carried out for transient 2-D laminar air flow in a pipe with application of multiple magnetic fields at the point of uniform heat flux heating and then uniform cooling from the wall. Three cases are studied for pipe lengths L = 10 with a single electric coil, L = 20 with two electric coils and L = 30 with three electric coils to generate the magnetic field with ξ from 0 to 2×107, which represents the strength of the magnetic field and the uniform heat flux from the pipe wall. The results show that magnetic fields generated by the multi-coils can drive the air flow in the longer pipe almost equally with the shorter one with a single coil. The converged axial pressure and pressure gradient distribution reveal the effect of magnetic force as a driving force to enhance the volume flow rate. The acting region depends on the combination of strength of magnetic field and temperature difference distributions. The magnetic force induced by magnetic field gradients and temperature difference can work as driving pumps for air flow in a long pipe.