The Experts below are selected from a list of 258168 Experts worldwide ranked by ideXlab platform
T. Hirschler - One of the best experts on this subject based on the ideXlab platform.
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A Parametric Study of self-similar collapsing shock waves in radiating gas
Physics of Fluids, 2002Co-Authors: T. HirschlerAbstract:For a collapsing shock wave in a thermal radiating thick gas the temperature gradient at the shock front is a free parameter in the framework of similarity. It must be adjusted to a particular converging shock-broadening problem to achieve information about the collapse of this shock wave. In a previous work a constraint was put on this temperature gradient to show only the influence of less radiation upon the similarity solution in the thick limit. In this paper a variation of this temperature gradient is permitted. In the framework of a Parametric Study the whole variety of possible similarity solutions is shown. Special attention is paid to those solutions showing the influence of much radiation. For the sake of a better overview, the Parametric Study first deals with a shock front where no radiative heat flux is exchanged between the shock front and the flow field, but the absorptivity of the gas is altered. Then the absorptivity of the gas is kept constant, but a heat flux exchange between the shock front and the flow field is permitted. In the framework of this Parametric Study, the isothermal solution plays the role of a limiting solution for a decreasing absorptivity. Solutions are shown up to this extreme and the isothermal solution is treated separately.
Li Qin - One of the best experts on this subject based on the ideXlab platform.
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Parametric Study of CSR1000 thermal hydraulic stability
Progress in Nuclear Energy, 2018Co-Authors: Muhammad Ali Shahzad, Tao Zhou, Liang Liu, Li QinAbstract:Abstract A Parametric Study is performed on thermal hydraulic stability of CSR1000 (a Chinese supercritical water-cooled reactor) using SCTHSAC (Single Channel Thermal Hydraulic Stability Analysis Code). This code uses RMM (system response matrix method) for analyzing the system stability in the frequency domain, a useful method to reveal detailed information about the operational thermodynamic parameters before and after onset of instability in the nuclear reactor. System response matrices are written for each node of the single coolant channel (by linearizing and perturbing conservation differential equations), which are solved for decay ratios. The maximum decay ratio represents stability of the whole system. The decay ratios are calculated for different values of reactor power and inlet orifice diameters. A Parametric Study of pressure, inlet temperature and moderator flow fraction is presented, which gives vital information about the thermal hydraulic stability bounds of CSR1000 in a sliding pressure startup scheme. The results show a similar trend with the stability charts of a typical SCWR, proving the novelty of RMM. Using this method, a stability surface is generated against power and flow fraction, giving a quick reference for designing a detailed startup scheme of CSR1000 in the future.
K Manjunath - One of the best experts on this subject based on the ideXlab platform.
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a Parametric Study of a concentrating integral storage solar water heater for domestic uses
Applied Thermal Engineering, 2017Co-Authors: Jaji Varghese, K ManjunathAbstract:Abstract A Parametric Study of a concentrating integrated collector storage solar water heater was undertaken. The concentrator used was the Compound Parabolic Concentrator (CPC), an optical non-imaging device, a wider acceptance angle was used (64°) so that only occasional tracking is needed making this suitable for household purposes. The reflective concentrator was supported on a wooden cradle which comprised the two parabolas of the compound parabolic concentrator. Unlike conventional CPC systems with a large number of smaller diameter tubes, here is a single larger diameter drum was positioned at the focus of the CPC. Experimental studies were carried out and the mean collector efficiency computed on the model with an air gap introduced in the side walls (arms of the CPC). The Parametric Study of the design by EES at solar noon was in good agreement with the collected experimental results. The maximum thermal efficiency of the collector was 38% and the maximum water temperature attained was 53 °C.
R. Cengiz Ertekin - One of the best experts on this subject based on the ideXlab platform.
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Parametric Study of nonlinear wave loads on submerged decks in shallow water
Journal of Fluids and Structures, 2019Co-Authors: Masoud Hayatdavoodi, Kayley Treichel, R. Cengiz ErtekinAbstract:Abstract This Study is concerned with calculations of nonlinear wave loads on submerged, horizontal decks in shallow water. Solitary and cnoidal wave loads on submerged decks are determined by use of the Level I Green–Naghdi (GN) equations. Results of the GN equations are compared with the linear theory, CFD, and with available laboratory measurements. Variation of the horizontal and vertical wave-induced loads and the overturning moment on submerged decks is studied through an extensive Parametric Study. In total, 240 cases are considered for cnoidal waves and 84 cases for solitary waves. The variable parameters include the wave height, wave period, deck submergence depth and deck length. Based on the Parametric Study results, two empirical, design-type equations are suggested for estimating the vertical and horizontal forces on submerged decks. Results of the empirical equations are compared with the available laboratory measurements and CFD calculations and good agreement is observed. Examples are provided to demonstrate the use of the empirical equations for prototype cases. The Parametric Study and the empirical equations provide engineers with the preliminary determination of wave loads on submerged decks.
Muhammad Ali Shahzad - One of the best experts on this subject based on the ideXlab platform.
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Parametric Study of CSR1000 thermal hydraulic stability
Progress in Nuclear Energy, 2018Co-Authors: Muhammad Ali Shahzad, Tao Zhou, Liang Liu, Li QinAbstract:Abstract A Parametric Study is performed on thermal hydraulic stability of CSR1000 (a Chinese supercritical water-cooled reactor) using SCTHSAC (Single Channel Thermal Hydraulic Stability Analysis Code). This code uses RMM (system response matrix method) for analyzing the system stability in the frequency domain, a useful method to reveal detailed information about the operational thermodynamic parameters before and after onset of instability in the nuclear reactor. System response matrices are written for each node of the single coolant channel (by linearizing and perturbing conservation differential equations), which are solved for decay ratios. The maximum decay ratio represents stability of the whole system. The decay ratios are calculated for different values of reactor power and inlet orifice diameters. A Parametric Study of pressure, inlet temperature and moderator flow fraction is presented, which gives vital information about the thermal hydraulic stability bounds of CSR1000 in a sliding pressure startup scheme. The results show a similar trend with the stability charts of a typical SCWR, proving the novelty of RMM. Using this method, a stability surface is generated against power and flow fraction, giving a quick reference for designing a detailed startup scheme of CSR1000 in the future.