scholarly journals Analytical Solution of Isentropic Spiral Flow for Particular Specific Heat Ratio

2004 ◽  
Vol 47 (155) ◽  
pp. 75-77
Author(s):  
Etsuo MORISHITA
Keyword(s):  
Analytical Solution ◽  
Specific Heat ◽  
Spiral Flow ◽  
Specific Heat Ratio

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

scholarly journals Exact Solution to the Extended Zwanzig Model for Quasi-Sigmoidal Chemically Induced Denaturation Profiles: Specific Heat and Configurational Entropy

2014 ◽  
Vol 2014 ◽  
pp. 1-11
Author(s):  
G. E. Aguilar-Pineda ◽  
L. Olivares-Quiroz
Keyword(s):  
Exact Solution ◽  
Analytical Solution ◽  
Specific Heat ◽  
Configurational Entropy ◽  
Naturally Occurring ◽  
Thermodynamic Potentials ◽  
Chemically Induced ◽  
Denaturation Profile ◽  
Average Internal Energy ◽  
Proteins And Peptides

Temperature and chemically induced denaturation comprise two of the most characteristic mechanisms to achieve the passage from the native state N to any of the unstructured states Dj in the denatured ensemble in proteins and peptides. In this work we present a full analytical solution for the configurational partition function 𝒵qs of a homopolymer chain poly-X in the extended Zwanzig model (EZM) for a quasisigmoidal denaturation profile. This solution is built up from an EZM exact solution in the case where the fraction α of native contacts follows exact linear dependence on denaturant’s concentration ζ; thus an analytical solution for 𝒵L in the case of an exact linear denaturation profile is also provided. A recently established connection between the number ν of potential nonnative conformations per residue and temperature-independent helical propensity ω complements the model in order to identify specific proteinogenic poly-X chains, where X represents any of the twenty naturally occurring aminoacid residues. From 𝒵qs, equilibrium thermodynamic potentials like entropy 𝒮 and average internal energy 〈E〉 and thermodynamic susceptibilities like specific heat C𝓋 are calculated for poly-valine (poly-V) and poly-alanine (poly-A) chains. The influence of the rate at which native contacts denature as function of ζ on thermodynamic stability is also discussed.

Clement-Desormes Measurements in Low-Pressure Superheated Steam

1972 ◽  
Vol 94 (3) ◽  
pp. 956-958
Author(s):  
J. H. Potter
Keyword(s):  
Specific Heat ◽  
Superheated Steam ◽  
Low Pressure ◽  
Velocity Of Sound ◽  
Free Expansion ◽  
Specific Heat Ratio

The specific heat ratio γ, was measured in low-pressure superheated steam, using a modified form of the free expansion experiment performed originally by Clement and Desormes. Values for γ are compared to those obtained from velocity of sound experiments, and to those calculated from the equations used in the ASME Steam Tables of 1967.

Temperature anomalies of hypersound velocity and specific heat ratio in liquid Quinoline

2005 ◽  
Vol 354 ◽  
pp. 34-48 ◽  
Author(s):  
Louis Letamendia ◽  
Miad Belkadi ◽  
Omar Eloutassi ◽  
Jacques Rouch ◽  
Dino Risso ◽  
...  
Keyword(s):  
Specific Heat ◽  
Specific Heat Ratio ◽  
Temperature Anomalies
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