Decomposition of effective specific heat of molecular relaxation for gas detection in a mixture

2017 ◽  
Vol 141 (3) ◽  
pp. 1844-1851 ◽  
Author(s):  
Tingting Liu ◽  
Shu Wang ◽  
Ming Zhu
Keyword(s):  
Specific Heat ◽  
Gas Detection ◽  
Molecular Relaxation ◽  
Effective Specific Heat

A Comparison of Input Data Used to Represent Phase Transformations during the Quenching of a Large Nuclear Forging

2016 ◽  
Vol 716 ◽  
pp. 555-565
Author(s):  
Michael P. Howson ◽  
Bradley P. Wynne ◽  
Peter S. Davies ◽  
Sinan S. Al-Bermani ◽  
Jesus Talamantes-Silva
Keyword(s):  
Specific Heat ◽  
Latent Heat ◽  
Lower Bainite ◽  
Cooling Curve ◽  
Model Parameters ◽  
Cooling Curves ◽  
Scanning Calorimetry ◽  
Effective Specific Heat ◽  
Input Variables ◽  
Predictive Software

The present work explores the importance of model parameters and input variables when simulating the quenching of thick sectioned nuclear forgings. The modelling approach adopted uses values of specific heat capacity, containing latent heat release, to simulate cooling curves; rather than calculating transformation kinetics based upon a mathematical model. Termed the effective specific heat (Cpeff), two different methods were used to establish values: differential scanning calorimetry (DSC) and thermos dynamic predictive software. Values were then included in finite element (FE) models to simulate the characteristic cooling at the mid-wall position in a thick section forging and were validated against production thermocouple data. The investigation found that the formation of ferrite, bainite and martensite or lower bainite were all represented by the data established using DSC and critical formation temperatures were comparable with others in the literature. Conversely, values calculated using the thermodynamic software failed to represent ferrite formation and predicted different critical transformation temperatures for bainite. The simulated cooling curve that used the software predicted Cpeff data was comparable to the thermocouple data either side of the bainite transformation, however during the transformation the effects of latent heat on cooling rate were over predicting leading to disparities. The equivalent DSC cooling curves produced a near exact match.

Measurement of effective specific heat of packed bed materials by the continuous flow electrical method

Pramana ◽  
1974 ◽  
Vol 3 (6) ◽  
pp. 383-389
Author(s):  
P B Lal Chaurasia ◽  
D R Chaudhary ◽  
R C Bhandari
Keyword(s):  
Specific Heat ◽  
Continuous Flow ◽  
Packed Bed ◽  
Electrical Method ◽  
Effective Specific Heat ◽  
Bed Materials

scholarly journals Determination of effective specific heat capacity of interior plaster containing phase change materials

2019 ◽  
Vol 282 ◽  
pp. 02052
Author(s):  
Václav Kočí ◽  
Jiří Maděra ◽  
Robert Černý
Keyword(s):  
Heat Capacity ◽  
Phase Change ◽  
Specific Heat ◽  
Specific Heat Capacity ◽  
Building Materials ◽  
Phase Change Materials ◽  
Calorimetric Data ◽  
Thermal Oscillation ◽  
Effective Specific Heat

A precise technique for determination of effective specific heat capacity of building materials is presented within this paper. The applicability of the technique is demonstrated on a PCM-enhanced plaster, being characterized by a phase change between 15 and 30 °C. The effective specific heat capacity is determined by means of inverse analysis of calorimetric data using computational model of the device. The identified effective specific heat capacity values reached up to 1890 J·kg-1·K-1 when cooled and 1580 J·kg-1·K-1 when heated. Using this quantity in simulation of thermal performance, the PCM-enhanced plaster showed to have a promising potential to be used in buildings’ interiors as a thermal regulator to stabilize inner environment as it contributed to a thermal oscillation decrease by up to 2.5 °C

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.

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.

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