Table 1.

Summary of experiments performed with the system

Experiment	ROT shapes	Near field monitoring	Depth	Acoustic power	Pre-cooling time (min)	Time to target temperature (min)	Time at steady state (min)
1	square	No	60 mm	26.8 W	–	7:44	5:04
	elliptical					3:24	4:19
	diagonal					6:59	5:26
	triangular					6:39	9:34
2	rhombic	Yes	60 mm	20 W	–	6:11	5:29
3	rhombic	Yes	35 mm	20 W	–	2:50	8:18
4	rhombic	Yes	35 mm	20 W	28	2:58	8:13