This discussion group began long ago with discussions of vortex-induced cavitation, also known as sonofusion. Examples include the work of Roger Stringham and the hydrodynamics gadget (https://www.hydrodynamics.com/). (Look up Stringham in the LENR-CANR.org index, https://lenr-canr.org/wordpress/?page_id=1081)
I would like to draw your attention to an ICCF23 presentation about this approach. The title does not indicate that's what it is about: Excess Energy from Heat-Exchange Systems Abstract: http://ikkem.com/iccf23/orppt/ICCF23-IA-21%20Huang.pdf In ICCF22, we presented a vapor compression machine (VCS-1) using a 2.75RT freon compressor (Figure 1) which can produce excess energy [1]. The hot refrigerant vapor from the compressor (around 150°C) is used to heat the water flowing through a tiny passage of a triple-pipe heat exchanger. This may cause a violent cavitation of water. The machine was modified furthermore and tested for two years since then. The calorimetric method for COP measurement was improved. The COP inside the steam generator is defined as the heat carried away by water (Qwnet) divided by the net heat input (Wt - QL), denoted as COPx . This is used as the criterion to determine the possibility of excess energy generation. If the measured COPx was greater than 1, then the cavitation-induced low-energy nuclear reaction (LENR) might occur. The test shows that the maximum COPx reaches 1.97 (Figure 1) and COPx increases with decreasing inlet water temperature. . . . Video: http://ikkem.com/iccf23/MP4/3b-IN22.mp4 In the video lecture, the COP is shown as high as 1.97 (minute 10). Excess heat, when present, ranges from 2.15 to 4.18 kW (minute 16:30). With one reactor, there were 4 months with no heat, which can be taken as a baseline calibration, followed by 2 months of excess heat (minute 16). An upcoming JCMNS paper has more details.
