By Vladimir B. Khabensky, Vladimir Antonovich Gerliga
Thermal-hydraulic instability can possibly impair thermal reliability of reactor cores or different strength apparatus elements. hence it is very important handle balance matters in strength apparatus linked to thermal and nuclear installations, relatively in thermal nuclear strength crops, chemical and petroleum industries, house expertise, and radio, digital, and machine cooling structures. This booklet synthesizes effects from instability investigations around the globe. The authors contain person examples on circulate balance in quite a few sorts of gear, together with boilers, reactors, steam turbines, condensers, warmth exchangers, generators, pumps, deaerators, bubblers, and pipelines It additionally provides thermal-acoustic instability, stream instability with supercritical parameters, and single-phase coolant circulation static instability. the fabric defined during this booklet is derived from monstrous quantities of experimental information from thermal-physical try amenities and full-scale installations. This ebook offers wisdom of a number of the varieties of move instability, the gear the place this instability can occur, and the consequent effects, in addition to makes techniques referring to attainable removing or mitigation of those consequences. Read more...
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Additional info for Coolant Flow Instabilities in Power Equipment
9 Dependence of the flow rate fluctuations’ amplitude on the exit quality at different heat inputs  (N1 < N2 < N3). been obtained in Zavalsky et al.  on a natural circulation system model. 9 from the above-cited work shows that with the increasing input power, which is equivalent to the increase of the heat flux surface density, the region of exit bulk qualities (with thermal-hydraulic flow instability) increases, as well as the oscillations’ amplitude, in spite of an increase in the loop flow rate.
The use of displacers in individual riser sections, apart from the increasing outlet resistance, also decreases the time constant of the coolant transit through the riser section. This may stabilize the flow, if the riser section time constant becomes lower (or higher) than that of the coolant in the channel heated section, thereby reducing the amplitude of oscillations of the pressure drop and flow rate. 4). In practice, most often the parameters ratio is manipulated, so flow stabilization is achieved through a decrease in the riser section time constant.
Here, throttling through the entire channel of the natural-circulation system may impair cell flow rate stability because of the reduced channel flow. If a natural-circulation loop is considered as a single channel with the upstream nonheated downflow section of high resistance, the region of interchannel instability, as is noted in references 7, 9, and 14, is substantially wider as compared to the circulation loop instability (if height reduction of individual riser sections does not eliminate the interchannel instability).