This open-access engineering paper by four Ukrainian authors, on examining a cavitation heat generator and a method for controlling how efficiently it operates, carries a 2017 copyright and a Creative Commons Attribution 4.0 licence. It concerns a class of machine that is a close cousin of the Schaeffer Steam Generator: a device that heats liquid by driving cavitation in it. Unlike the Schaeffer material, it comes from an academic and industrial setting, and its abstract makes no claim of energy gain.
Who wrote it
Three of the authors are listed at the Ukrainian State University of Chemical Technology in Dnipro: Viktor Ved, a senior lecturer in the department of chemical plant equipment; Valeriy Nikolsky, a professor in the energy department; and Olga Oliynyk, an associate professor in computer-integrated technologies and metrology. The fourth, Alexander Lipeev, is listed as general director of LLC "Ukravia" in Pavlograd.
What the paper reports
What the headline result is. The one performance number the authors give is that their system's efficiency "exceeds 18 % compared to the system of centralized heating by natural gas", a result they call promising. The system in question is a heating arrangement for industrial buildings and facilities that do not rely on a central plant, built around a cavitation heat generator that the authors say was put into actual operation.
Why two generators instead of one? The design's distinguishing feature is a pair of cavitation heat generators connected in series, so the liquid is heated by both in turn: first a unit running at high frequency, then one running at a lower frequency. The abstract's rationale is that the two frequencies do different jobs. Small cavitation "embryos" are seeded at the high-frequency stage and enlarged at the low-frequency stage, and the authors' abstract states that this raises the cavitation pressure impulses and strengthens the overall cavitation effect. The authors propose this sequential installation as their way of improving the system's energy efficiency.
How the process is kept on track. Separately, the authors' abstract describes a method for controlling the effectiveness of cavitation while a generator runs. In their words it rests on suppressing waves of oscillatory energy of the object, and the parameter they monitor is vibration, measured directly, which they describe as characterising the cavitation process. According to the abstract, the method was trialled by recording vibration while the outlet liquid was at different temperatures.
The efficiency figure, and what it means
The abstract presents the 18 % figure as a relative efficiency advantage over gas-fired centralized heating, but does not define it. It does not say what quantity the 18 % refers to (cost, primary fuel, delivered heat or something else), nor how the gas-fired baseline was defined or measured. Nothing in the abstract suggests that the cavitation heater turns its input into more heat than it receives.
Why it belongs in the Schaeffer dossier
The Schaeffer patent, US 3,791,349, describes a motor-driven rotor that heats water through repeated water-hammer shocks, and the dossier's press material attaches efficiency readings above 100 % to that machine (see Schaeffer Steam Generator Claims vs. Evidence: An Archive Dossier Without Test Data). This paper offers a useful reference point:
- The abstract's stated mechanism is the growth of cavitation embryos leading to stronger cavitation pressure impulses. As an editorial observation, this bears a loose analogy to the shock account in the Schaeffer patent; the abstract itself describes no shock-wave mechanism, concerns heated liquid for buildings rather than steam, and does not mention Schaeffer.
- The reference list includes Russian-language papers on heat generation in rotor-impulse (rotor-pulse) apparatus, which places it near rotor-driven hydrodynamic heaters, although the abstract does not draw that comparison.
- The abstract makes no energy-gain claim. Its efficiency argument is about doing better than an existing heating system, not about exceeding the energy supplied.
What the reported claims do not show
The abstract gives no account of:
- The rotor speeds, frequencies, power inputs, flow rates and temperatures behind the results.
- How the 18 % advantage was calculated, and whether it was measured over a heating season or estimated.
- How much of the improvement is due to the series high-then-low-frequency arrangement as opposed to the generators themselves; no single-generator comparison is reported.
- Whether the vibration-based control method was validated against an independent measure of cavitation intensity or heat output.
The abstract also says nothing about the Schaeffer machine, Sonaqua, the 1974 patent or the 1977 and 1995 press accounts. Its value to this dossier is as an independent, openly published example of researchers who build cavitation heaters for buildings stating performance as practical efficiency relative to an alternative, with no extra energy to explain.
Further reading
- US Patent 3,791,349 (1974): The Schaefer/Sonaqua Steam Generator and Its Water-Hammer Rotor — the Schaefer/Sonaqua rotor and its water-hammer mechanism.
- Schaeffer Steam Generator Claims vs. Evidence: An Archive Dossier Without Test Data — the reported Schaeffer efficiency figures and their limits.
- Steam Generator Claim — ordinary versus anomalous steam and heat generator claims.
- Steam Generation — conventional background.
Source notes & attribution
- https://journals.uran.ua/eejet/article/view/108580