The thermal and rewetting behavior of downward‐facing hot surfaces with single upward oblique liquid jet impingement is studied through experimental investigation. The Reynolds number varies in the range of 2500–10 000 and the jet inclination angle varies from 90° to 15°, measured from the horizontal. The current study uses a stainless‐steel foil (SS‐304) with 0.15 mm thickness as the test specimen, and a thermal imaging technique is used to measure temperature data during jet impingement cooling. The initial surface temperature of the test foil is maintained at 500 ± 10 °C and the standoff distance is kept at 6 mm. The Nusselt number is found to increase in the downhill direction and decrease sharply in the uphill direction with the decrease in the inclination angle. The wet‐front velocity is found to increase in the downhill direction with the decrease in the inclination angle. Correlations are proposed for Nusselt number and rewetting temperature as a function of Reynolds number, jet inclination angle, and axial distance.
This paper discusses performance evaluation of the steam and water system in a thermal power plant, with the help of developed probabilistic model. The system consists of six subsystems with two possible states: working and failed. Failure and repair rates for each subsystem are taken to be constant. Using a probabilistic approach, the differential equations are generated. After that, steady state probabilities are determined. Besides, availability matrix is also developed, which provide various availability levels. The performance evaluation reveals that availability figure decreases with increasing failure rates, while operational availability improves with initial increase in repair rates for different sub-systems. Based upon various availability values, performance of each subsystem is analyzed and then maintenance decisions are made for all subsystems.
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