Method of calculating the hydraulic resistance in vaporgenerating tubes at low specific heat flux

1965 ◽  
Vol 9 (6) ◽  
pp. 434-437 ◽  
Author(s):  
N. G. Styushin ◽  
G. A. Ryabinin
Keyword(s):  
Heat Flux ◽  
Specific Heat ◽  
Hydraulic Resistance

THE MECHANISM OF RAISING AND QUANTIFICATION OF SPECIFIC HEAT FLUX AT BOILING OF NANOFLUIDS IN FREE CONVECTION CONDITIONS

2017 ◽  
pp. 25-34
Author(s):  
V.N. Moraru
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Heat Capacity ◽  
Specific Heat ◽  
Chemical Properties ◽  
Heating Surface ◽  
Physical Models ◽  
Superheated Liquid ◽  
Two Phase ◽  
Boiling Process

The results of our work and a number of foreign studies indicate that the sharp increase in the heat transfer parameters (specific heat flux q and heat transfer coefficient _) at the boiling of nanofluids as compared to the base liquid (water) is due not only and not so much to the increase of the thermal conductivity of the nanofluids, but an intensification of the boiling process caused by a change in the state of the heating surface, its topological and chemical properties (porosity, roughness, wettability). The latter leads to a change in the internal characteristics of the boiling process and the average temperature of the superheated liquid layer. This circumstance makes it possible, on the basis of physical models of the liquids boiling and taking into account the parameters of the surface state (temperature, pressure) and properties of the coolant (the density and heat capacity of the liquid, the specific heat of vaporization and the heat capacity of the vapor), and also the internal characteristics of the boiling of liquids, to calculate the value of specific heat flux q. In this paper, the difference in the mechanisms of heat transfer during the boiling of single-phase (water) and two-phase nanofluids has been studied and a quantitative estimate of the q values for the boiling of the nanofluid is carried out based on the internal characteristics of the boiling process. The satisfactory agreement of the calculated values with the experimental data is a confirmation that the key factor in the growth of the heat transfer intensity at the boiling of nanofluids is indeed a change in the nature and microrelief of the heating surface. Bibl. 20, Fig. 9, Tab. 2.

scholarly journals Heat flux measurements of Tb3M series (M=Co, Rh and Ru): Specific heat and magnetocaloric properties

2016 ◽  
Vol 503 ◽  
pp. 64-69 ◽  
Author(s):  
J.C.B. Monteiro ◽  
G.A. Lombardi ◽  
R.D. dos Reis ◽  
H.E. Freitas ◽  
L.P. Cardoso ◽  
...  
Keyword(s):  
Heat Flux ◽  
Specific Heat ◽  
Magnetocaloric Properties ◽  
Flux Measurements

FIELDS OF SPECIFIC HEAT CAPACITY OF SUPERCRITICAL WATER FLOWING IN CHANNELS

2017 ◽  
Author(s):  
Nataliia Fialko ◽  
◽  
Viktor Prokopov ◽  
Nataliia Meranova ◽  
Sergey Aleshko ◽  
...  
Keyword(s):  
Heat Flux ◽  
Heat Capacity ◽  
Specific Heat ◽  
Specific Heat Capacity ◽  
Supercritical Water ◽  
Cfd Analysis

The data of CFD analysis of the specific heat capacity fields of supercritical water in round channels at different values of the heat flux supplied to the wall are presented.

Investigation of a New Simple Transient Method of Thermal Property Measurement

1974 ◽  
Vol 96 (1) ◽  
pp. 59-64 ◽  
Author(s):  
J. V. Beck ◽  
S. Al-Araji
Keyword(s):  
Thermal Conductivity ◽  
Heat Flux ◽  
Specific Heat ◽  
Simple Calculation ◽  
The Other ◽  
Electric Heater ◽  
Transient Method ◽  
Single Experiment ◽  
Transient Solutions ◽  
Property Measurement

New transient solutions are derived for the simple calculation of thermal conductivity, specific heat, thermal diffusivity and contact conductance from the results of a single experiment. All the proposed experiments utilize a specimen which has one surface insulated and the opposite one heated by an arbitrary heat flux. The heat flux must have a finite duration and its integrated value must be known. Two types of experiments are discussed and measurements for each type are given. One type uses a flat, thin electric heater and the other uses a material of known specific heat as a calorimeter. Relative advantages are discussed.

A heat flux DSC for enthalpy and specific heat determinations to 1700 k

1989 ◽  
Vol 148 ◽  
pp. 499-505 ◽  
Author(s):  
E. Kaisersberger ◽  
J. Janoschek ◽  
E. Wassmer
Keyword(s):  
Heat Flux ◽  
Specific Heat ◽  
Heat Flux Dsc

scholarly journals Specific Heat Measurements of Pd-based Alloy in the Liquid State by the Heat-Flux Type DSC with Triple Cells

2004 ◽  
Vol 68 (8) ◽  
pp. 499-502 ◽  
Author(s):  
Tsuyoshi Nishi ◽  
Hiroyuki Shibata ◽  
Hiromichi Ohta ◽  
Nobuyuki Nishiyama ◽  
Akihisa Inoue ◽  
...  
Keyword(s):  
Heat Flux ◽  
Specific Heat ◽  
Liquid State
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