Overview of geometrical effects on the critical flow rate of sub-cooled and saturated water

Kim, Yeon-Sik

doi:10.1016/j.anucene.2014.09.028

Cited by 15 publications

(7 citation statements)

References 5 publications

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“…Flashing nozzles have been most researched for ejector use because their conditions of moderate to low sub-cooling and low quality mixtures are the most encountered in EERC machines. Effects of inlet sub-cooling, fluid quality and flashing inception in expanding fluid flow on mass flow rates, have been among the main elements in the quest for relevant information on nozzle design criteria and mostly experimental [90][91][92][93].…”

Section: Thermodynamic and Analytical Modelingmentioning

confidence: 99%

Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 2: Two-Phase Ejectors

et al. 2019

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Two-phase ejectors play a major role as refrigerant expansion devices in vapor compression systems and can find potential applications in many other industrial processes. As a result, they have become a focus of attention for the last few decades from the scientific community, not only for the expansion work recovery in a wide range of refrigeration and heat pump cycles but also in industrial processes as entrainment and mixing enhancement agents. This review provides relevant findings and trends, characterizing the design, operation and performance of the two-phase ejector as a component. Effects of geometry, operating conditions and the main developments in terms of theoretical and experimental approaches, rating methods and applications are discussed in detail. Ejector expansion refrigeration cycles (EERC) as well as the related theoretical and experimental research are reported. New and other relevant cycle combinations proposed in the recent literature are organized under theoretical and experimental headings by refrigerant types and/or by chronology whenever appropriate and systematically commented. This review brings out the fact that theoretical ejector and cycle studies outnumber experimental investigations and data generation. More emerging numerical studies of two-phase ejectors are a positive step, which has to be further supported by more validation work.

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Section: Thermodynamic and Analytical Modelingmentioning

confidence: 99%

Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 2: Two-Phase Ejectors

et al. 2019

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“…In this report, the application of the correlation proposed previously [9] was extended to the entire range of steam-water flows (e.g., subcooled, saturated water, and two-phase steamwater flows), which simulates the whole regions of the suggested critical mass flux map [3] within a reasonable range of error.…”

Section: Introductionmentioning

confidence: 99%

“…To overcome the limitations of the orifice-type correlation, a practicable correlation predicting the critical flow rate for any kind of water condition using a Bernoulli-type relation was adopted from a previous study [9] as follows:…”

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confidence: 99%

A proposed correlation for critical flow rate of water flow

Kim

2015

Nuclear Engineering and Technology

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a b s t r a c tA new correlation predicting the idealized critical mass-flow rates of water for subcooled and saturated liquid water including two-phase water flow was developed for a wide range of upstream stagnation pressures (e.g., 0.5e20.0 MPa). A choking correction factor dependent on the upstream stagnation pressure and subcooled temperature was introduced into a new correlation, and its values were suggested to satisfy the idealized nozzle data within 10% error ranges. The suggested correlation will be instructive and helpful for related studies and/or engineering works.

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“…Likewise, flow measurement for varying liquid temperature and liquid type using venturi flow meter is achieved with the help of neural network-based calibration technique for adaptive control applications [9]. Prediction of mass flow rate was reported in reference [10] using an orifice flow meter for various geometrical effects. A brief comparison of different methods used for the measurement of flow rate is tabulated in Table 1.…”

Section: Introductionmentioning

confidence: 99%

A Soft Sensor for Estimation of In-Flow Rate in a Flow Process Using Pole Placement and Kalman Filter Methods

2019

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This article reports the design of a soft sensor for estimation of in-flow to the control valve in a flow process. The objective of the proposed work is to design and compare the performance of pole placement and Kalman filter-based observers. The observer is designed to estimate the in-flow from the measured out-flow. A mathematical model is derived for the considered physical plant using the system identification technique. An observer is designed using Pole Placement and Kalman Filter methods from the derived plant model. The obtained observer is implemented on a real-life setup for estimation of the in-flow rate. Results obtained from the designed observers are then analyzed to select the better observer. Comparison of performance based on results from Kalman Filter and Pole Placement method of observers shows that the former is more accurate, whereas the computation time is smaller in the latter. Results achieved from the designed soft sensor are verified using an electromagnetic flowmeter, and the results have a root-mean-square percentage error of 0.79%.

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Overview of geometrical effects on the critical flow rate of sub-cooled and saturated water

Cited by 15 publications

References 5 publications

Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 2: Two-Phase Ejectors

Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 2: Two-Phase Ejectors

A proposed correlation for critical flow rate of water flow

A Soft Sensor for Estimation of In-Flow Rate in a Flow Process Using Pole Placement and Kalman Filter Methods

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