scholarly journals Radius Ratios of Argon Pinches

1983 ◽  
Vol 36 (6) ◽  
pp. 891 ◽  
Author(s):  
S Lee
Keyword(s):  
Energy Balance ◽  
Specific Heat ◽  
Imperial College ◽  
Radius Ratio ◽  
Constant Current ◽  
Plasma Pinch ◽  
Specific Heat Ratio ◽  
Pinched Plasma ◽  
Effective Specific Heat ◽  
Good Agreement

According to a new theory based on energy balance, the radius ratio Yp/Yo of a constant-current plasma pinch depends only on the value of the effective specific heat ratio y of the pinched plasma. In this paper the value of y for argon is computed as a function of temperature. From these values the constant-current pinch ratios are computed. The results show argon pinch ratios of about o� 08 from (2-4) x 106 K, rising to 0�18 at 1�1 x 107 K and to O� 27 at 108 K. There is good agreement between this theory and an Imperial College measurement of Y o/ro ~ 0 �17 for a constant-current argon pinch at an estimated temperature of 1 keY.

Dimer Concentrations in Supersonic Free Jets

1972 ◽  
Vol 50 (20) ◽  
pp. 2464-2470 ◽  
Author(s):  
R. M. Yealland ◽  
J. M. Deckers ◽  
I. D. Scott ◽  
C. T. Tuori
Keyword(s):  
Specific Heat ◽  
Source Parameters ◽  
Supersonic Nozzle ◽  
Gas Pressure ◽  
Free Jets ◽  
Specific Heat Ratio ◽  
Source Temperature ◽  
Universal Dependence ◽  
Effective Specific Heat

Measurements have been made of the concentration of dimers produced during the expansion from a supersonic nozzle. The gases studied were: Ar, N2,O2, CO, CO2, C2H4, and N2O. It is shown that an effective specific heat ratio of the expanding gas offers a means of correlating the dimer concentration in terms of the source gas pressure and temperature. The two nozzles employed had opening diameters of 0.14 mm and 0.065 mm. An attempt to obtain a universal dependence for all gases in terms of reduced source parameters was partially successful. Source temperature was varied between 90 °K and 295 °K.

Enhanced Specific Heat of Molten Salt Nano-eutectic via Nanostructural Change

2021 ◽  
Author(s):  
Hani Tiznobaik ◽  
Zahra Pournorouz ◽  
Joohyun Seo ◽  
Amirhossein Mostafavi ◽  
Donghyun Shin
Keyword(s):  
Theoretical Prediction ◽  
Specific Heat ◽  
Molten Salt ◽  
Sio2 Nanoparticles ◽  
Dynamics Simulation ◽  
Proposed Model ◽  
Effective Specific Heat ◽  
Characterization Studies ◽  
Measured Specific Heat ◽  
Good Agreement

Abstract In this study, the specific heat of molten salt nano-eutectic (Li2CO3-K2CO3 doped with SiO2 nanoparticles) was theoretically and computationally investigated. According to the proposed theory in the literature [1], the effective specific heat of a nano-eutectic can be significantly enhanced by the formation of needle-like nanostructures by salt eutectic. To investigate the effect of the formed nanostructure, its specific heat was theoretically calculated by the model used by Wang and other researchers [2-4]. The mass fraction of the formed nanostructure was estimated by MATLAB using the reported material characterization studies [1, 5, 6]. The theoretical prediction made a good agreement with the measured specific heat values from the literature with an error less than 3 %. Additional verification of the proposed model was performed by a molecular dynamics simulation study. The simulated specific heat of pure molten salt eutectic made a good agreement with the literature value (1.6 kJ/kg°C with an error less than 1.7 %). The simulated specific heat of nano-eutectic was 2.017 kJ/kg°C. The error between the theoretical prediction and the simulation is only 3.4 % and the value made a good agreement with the experiment (1.9 % max. error). The result shows the enhanced specific heat of a nano-eutectic can be explained by the contribution of the formed nanostructures.

Analysis of the Impact of Specific Heat Ratio on Two-Dimensional Low Maher Number Nozzle Design

2014 ◽  
Vol 590 ◽  
pp. 546-550
Author(s):  
Zhi Qiang Fan ◽  
Hai Bo Yang ◽  
Fei Zhao ◽  
Rong Zhu ◽  
Dong Bai Sun
Keyword(s):  
Specific Heat ◽  
Supersonic Nozzle ◽  
Two Dimensional ◽  
Nozzle Design ◽  
Scheme Design ◽  
Specific Heat Ratio ◽  
Nozzle Contour ◽  
Ratio Change ◽  
Change Impact ◽  
The Impact

The practical requirements of the project the nozzle entrance temperature is high, the gas specific heat ratio varies greatly, so it must consider the specific heat ratio change impact on two-dimensional nozzle contour design. Divided into consideration specific heat ratio change and not consider two kinds of scheme design of 1.4Ma nozzle profile and build the model using the arc line method, numerical simulation is carried out through the CFD software Fluent, analysis of two kinds of design scheme comparison. The results show that, in the supersonic nozzle at low Maher numbers, two schemes of nozzle design profile similarity, parameters change little flow tube, export the Maher number and the flow quality can meet the design requirements, proof of specific heat ratio has little effect on the design results in the design of the nozzle under the condition of low Maher number.

Modelling and Simulation of Transient Performance of the Semi-Closed O2/CO2 Gas Turbine Cycle for CO2-Capture

2003 ◽  
Author(s):  
Ragnhild E. Ulfsnes ◽  
Olav Bolland ◽  
Kristin Jordal
Keyword(s):  
Water Vapor ◽  
Specific Heat ◽  
Gas Turbine ◽  
Transient Behavior ◽  
Cycle Performance ◽  
Working Fluid ◽  
Transient Event ◽  
Co2 Gas ◽  
Specific Heat Ratio ◽  
Gas Turbine Cycle

One of the concepts proposed for capture of CO2 in power production from gaseous fossil fuels is the semi-closed O2/CO2 gas turbine cycle. The semi-closed O2/CO2 gas turbine cycle has a near to stoichiometric combustion with oxygen, producing CO2 and water vapor as the combustion products. The water vapor is condensed and removed from the process, the remaining gas, primarily CO2, is mainly recycled to keep turbine inlet temperature at a permissible level. A model for predicting transient behavior of the semi-closed O2/CO2 gas turbine cycle is presented. The model is implemented in the simulation tool gPROMS (Process System Enterprise Ltd.), and simulations are performed to investigate two different issues. The first issue is to see how different cycle performance variables interact during transient behavior; the second is to investigate how cycle calculations are affected when including the gas constant and the specific heat ratio in compressor characteristics. The simulations show that the near to stoichiometric combustion and the working fluid recycle introduce a high interaction between the different cycle components and variables. This makes it very difficult to analytically predict the cycle performance during a transient event, i.e. simulations are necessary. It is also found that, except for the shaft speed calculation, the introduction of gas constant and specific heat ratio dependence on the compressor performance map will have only a minor influence on the process performance.

Specific Heat Ratio of High Methane Fraction Natural Gas/Air in Confined Vessel

2015 ◽  
Author(s):  
Chenglong Tang ◽  
Zhanbo Si ◽  
Shuang Zhang ◽  
Zuohua Huang ◽  
Shiyi Pan ◽  
...  
Keyword(s):  
Natural Gas ◽  
Specific Heat ◽  
Specific Heat Ratio
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