Heat flow in the Bastar Craton, central Indian Shield: implications for thermal characteristics of Proterozoic cratons

1993 ◽  
Vol 78 (1-2) ◽  
pp. 23-31 ◽  
Author(s):  
M.L. Gupta ◽  
A. Sundar ◽  
S.R. Sharma ◽  
S.B. Singh
Keyword(s):  
Heat Flow ◽  
Thermal Characteristics ◽  
Indian Shield ◽  
Bastar Craton

scholarly journals Heat flow in the Indian shield

2000 ◽  
Vol 105 (B11) ◽  
pp. 25587-25604 ◽  
Author(s):  
Sukanta Roy ◽  
R. U. M. Rao
Keyword(s):  
Heat Flow ◽  
Indian Shield

A petrogenetic relationship between 2.37 Ga boninitic dyke swarms of the Indian Shield: Evidence from the Central Bastar Craton and the NE Dharwar Craton

2019 ◽  
Vol 69 ◽  
pp. 193-211 ◽  
Author(s):  
Alice C.-Y. Liao ◽  
J. Gregory Shellnutt ◽  
Kosiyathu R. Hari ◽  
Steven W. Denyszyn ◽  
Neeraj Vishwakarma ◽  
...  
Keyword(s):  
Dharwar Craton ◽  
Indian Shield ◽  
Bastar Craton ◽  
Dyke Swarms

scholarly journals Heat flow in Rajasthan Craton, North–Western Indian Shield and its Implications

2018 ◽  
Vol 1 (1) ◽  
pp. 30-34
Author(s):  
Mohan Lal Gupta ◽  
Shadi Sharma
Keyword(s):  
Heat Flow ◽  
Its Region ◽  
High Heat ◽  
Tectonic Activity ◽  
Fold Belt ◽  
Indian Shield ◽  
North West ◽  
Thermal Transients ◽  
North Western ◽  
Q Values

A synthesis and reinterpretation of surface heat flow values of the Rajasthan Craton(RC), north-western Indian Shield has been carried out. The results reveal that the q values are relatively high, varying from 52 to 96 mWm-2. Appreciable variations in the magnitude of q are found between and within its geotectonic units, but with considerable overlap of values. Paleo–Meso Proterozoic Aravalli Super Group is generally associated with high q values, varying from 52 to 67 mWm-2, with a mean value of 60 mWm-2. Values of still higher order varying from 52 to 76 mWm-2 occur in North Delhi Fold Belt of Meso–Neo Proterozoic Delhi super Group, Tusham area, which is located towards north west corner of the Delhi Fold Belt in the Trans-Aravalli Province of RC, is characterized by a very high heat flow value. This is the highest of all heat flow values so far reported for the Proterozoic terrains of the Indian Shield, which is ascribed as due both to enhanced crustal radioactivity and renewed tectonic activity beneath its region. The heat flow values reported in areas of the Delhi Super Group and Aravalli Super Group are of short wavelength, naturally these are due to shallow sources. We infer that these are mostly due to varying degrees of concentration of heat producing elements in the upper crust. There are also no evidences of major tectono-thermal events after the Neo-Proterozoic times (~600Ma) in the study area. Hence, we conclude that observed variations in heat flow do not carry thermal transients of any recent tectonic activity.

scholarly journals ALTERNATIVE METHOD FOR ON SITE EVALUATION OF THERMAL TRANSMITTANCE

2017 ◽  
Vol 15 (2) ◽  
pp. 341 ◽  
Author(s):  
Aleksandar Janković ◽  
Biljana Antunović ◽  
Ljubiša Preradović
Keyword(s):  
Heat Flow ◽  
Thermal Characteristics ◽  
Building Envelope ◽  
Heat Losses ◽  
Flow Meter ◽  
Simple Method ◽  
Building Element ◽  
Thermal Transmittance ◽  
Heat Flow Meter

Thermal transmittance or U-value is an indicator of the building envelope thermal properties and a key parameter for evaluation of heat losses through the building elements due to heat transmission. It can be determined by calculation based on thermal characteristics of the building element layers. However, this value does not take into account the effects of irregularities and degradation of certain elements of the envelope caused by aging, which may lead to errors in calculation of the heat losses. An effective and simple method for determination of thermal transmittance is in situ measurement, which is governed by the ISO 9869-1:2014 that defines heat flow meter method. This relatively expensive method leaves marks and damages surface of the building element. Furthermore, the final result is not always reliable, in particular when the building element is light or when the weather conditions are not suitable. In order to avoid the above mentioned problems and to estimate the real thermal transmittance value an alternative experimental method, here referred as the natural convection and radiation method, is proposed in this paper. For determination of thermal transmittance, this method requires only temperatures of inside and outside air, as well as the inner wall surface temperature. A detailed statistical analysis, performed by the software package SPSS ver. 20, shows several more advantages of this method comparing to the standard heat flow meter one, besides economic and non-destructive benefits.

Minimizing the Wick Thickness in a Planar Microscale Loop Heat Pipe Using Efficient Thermodynamic Design

2011 ◽  
Author(s):  
Navdeep S. Dhillon ◽  
Jim C. Cheng ◽  
Albert P. Pisano
Keyword(s):  
Heat Flow ◽  
Heat Pipe ◽  
Thermal Characteristics ◽  
Heat Pipes ◽  
Working Fluid ◽  
Loop Heat Pipe ◽  
Two Phase ◽  
Loop Heat Pipes ◽  
Evaporator Section ◽  
Compensation Chamber

Theoretical and numerical thermodynamic analysis of the evaporator section of a planar microscale loop heat pipe is presented, to minimize the permissible wick thickness in such a device. In conventional cylindrical loop heat pipes, a minimum wick thickness is required in order to reduce parasitic heat flow, and prevent vapor leakage, into the compensation chamber. By taking advantage of the possibilities allowed by microfabrication techniques, a planar evaporator/compensation chamber design topology is proposed to overcome this limitation, which will enable wafer-based loop heat pipes with device thicknesses on the order of a millimeter or less. Thermodynamic principles governing two-phase flow of the working fluid in a loop heat pipe are analyzed to elucidate the fundamental requirements that would characterize the startup and steady state operation of a planar phase-change device. A three dimensional finite element thermal-fluid solver is implemented to study the thermal characteristics of the evaporator section and compensation chamber regions of a planar vertically wicking micro-columnated loop heat pipe. The use of in-plane thermal conduction barriers to reduce parasitic heat flow into the compensation chamber is demonstrated.

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