Download Coolant Flow Instabilities in Power Equipment by Vladimir B. Khabensky, Vladimir Antonovich Gerliga PDF

By Vladimir B. Khabensky, Vladimir Antonovich Gerliga

Thermal-hydraulic instability can almost certainly impair thermal reliability of reactor cores or different energy apparatus parts. hence you will need to deal with balance matters in energy gear linked to thermal and nuclear installations, relatively in thermal nuclear strength crops, chemical and petroleum industries, area expertise, and radio, digital, and machine cooling platforms. This publication synthesizes Read more...

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Coolant Flow Instabilities in Power Equipment

Thermal-hydraulic instability can in all probability impair thermal reliability of reactor cores or different strength gear elements. hence it is very important handle balance concerns in energy gear linked to thermal and nuclear installations, rather in thermal nuclear energy vegetation, chemical and petroleum industries, house know-how, and radio, digital, and computing device cooling structures.

Extra resources for Coolant Flow Instabilities in Power Equipment

Example text

However, the previously cited works also show that in a narrow range of geometries and flow parameters, especially at small heights of individual risers, the hydraulic characteristic may have an ambiguous portion. In such a case, flow rate oscillations due to static instability may be observed, or static and dynamic instabilities may be superimposed. The mentioned particular cases of instabilities had led some authors to the erroneous conclusion about mandatory existence of an ambiguous hydraulic channel characteristic for the initiation of oscillatory flow instability at low exit qualities.

If the pressure is rising, several factors contribute to stability. First, it is the reduced relative share of friction pressure drop in the evaporating section in the total pressure drop due to higher average density of the fluid in the evaporating section. Second, it is the decreased maximum density gradient in the two-phase section because of the reduced gradient of change of the two-phase coolant density because of enthalpy and, hence, the reduced amplitude of the outlet flow rate oscillations.

If thermal difference between parallel channels is not big, the further increase in power initiates instability in the less heat-loaded channel, while the heatloaded channel becomes stable, starts operating with forced and antiphase (with respect to the less heat-loaded channel) flow rate fluctuations, and decreases the flow rate fluctuations’ amplitude in the unstable channel. , they seem to destabilize the system, which is not always really the case). The presented qualitative analysis of the effect of parameters on the instability boundary at low exit qualities is based on the well-known published experimental and prediction results.

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