Experimental setup for generating and probing HeII flows

A flexible experimental setup for the investigation of He II flow and turbulence generated by (i) thermal counterflow, ( ii) thermally-induced pure superflow in channels of various crossections, (iii) between counterrotating discs with blades and (iv) due to a torsionally oscillating cylinder has been designed and constructed. The flows ( iii) and ( iv) are driven via a shaft by the PC controlled DC motor placed on the top flange of the cryostat. Our principal method of probing the flow is second sound attenuation; thermally-induced flows can additionally be probed by measuring the temperature difference along the channel.