Improve Heat Dissipation Rate of the Vehicle Radiator by Using Carbon Foam Material for the Fin

2013 ◽  
Author(s):  
Dhananjay Kale
Keyword(s):  
Dissipation Rate ◽  
Heat Dissipation ◽  
Carbon Foam ◽  
Foam Material

Evaluation of Compact and Effective Air-Cooled Carbon Foam Heat Sink

2011 ◽  
Vol 133 (5) ◽  
Author(s):  
W. Wu ◽  
J. H. Du ◽  
Y. R. Lin ◽  
L. C. Chow ◽  
H. Bostanci ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Sink ◽  
Heat Dissipation ◽  
Carbon Foam ◽  
Flow Speed ◽  
Transfer Coefficients ◽  
Air Inlet ◽  
Forced Air ◽  
L 51 ◽  
Corrugated Structure

This study investigates a V-shaped corrugated carbon foam heat sink for thermal management of electronics with forced air convection. Experiments were conducted to determine the heat sink performance in terms of heat transfer coefficient and pressure drop. The test section, with overall dimensions of 51 mm L×51 mm W×19 mm H, enabled up to 166 W of heat dissipation, and 3280 W/m2 K and 2210 W/m2 K heat transfer coefficients, based on log mean and air inlet temperatures, respectively, at 7.8 m/s air flow speed, and 1320 Pa pressure loss. Compared to a solid carbon foam, the V-shaped corrugated structure enhances the heat transfer, and at the same time reduces the flow resistance. Physical mechanisms underlying the observed phenomena are briefly explained. With benefits that potentially can reduce overall weight, volume, and cost of the air-cooled electronics, the present V-shaped corrugated carbon foam emerges as an alternative heat sink.

Ocean Turbulent Mixing in Northern Bohai Strait, China

2013 ◽  
Author(s):  
Shu-xiu Liang ◽  
Zhao-chen Sun ◽  
Song-lin Han ◽  
Hong-qiang Yin ◽  
Bo Bai
Keyword(s):  
Turbulent Mixing ◽  
Yellow Sea ◽  
Dissipation Rate ◽  
Bohai Sea ◽  
Heat Dissipation ◽  
Strong Mixing ◽  
Observation Data ◽  
Diffusivity Coefficient ◽  
Division Line ◽  
Bohai Strait

The measurements of ocean microstructure through which ocean internal mixing mechanism is revealed are taken more often recently. Free-falling turbulence microstructure profiler TurboMAP-9 is used to take a field observation on the area of northern Bohai Strait. 13 stations distributed in Bohai Sea, Yellow Sea and the “division line” between them are measured. Turbulent mixing characteristics of northern Bohai Strait for different seasons are described by analyzing the observation data of ocean turbulence microstructure profile. The results show that the northern Bohai Strait is a strong mixing area during non-stratification period. Turbulent energy dissipation rate ε of winter is bigger than that of autumn and it is strongest near the bottom layers which is in the order of 10−5W/kg. Heat dissipation rate χθ is in the same order of 10−6–10−5°C2/s in autumn as ε and 2–3 orders smaller than ε in winter. Thermal diffusivity coefficient kθ is a little bigger than turbulent mixing rate kρ in autumn and 1–2 orders smaller than kρ in winter. Both the kρ and kθ along the “division line” of Bohai Sea and Yellow Sea are bigger than that of the Bohai Sea and Yellow Sea. Base on the measured data and the analysis, heat dissipation rate and thermal dispersion coefficient can change 2–3 orders in non-stratification seasons which should be paid much attention to, especially for ocean model parameterization and pollutant discharge modeling.

“A REVIEW OF HEAT DISSIPATION ANALYSIS BY VARYING GEOMETRICAL CONDITION OF CYLINDRICAL FIN”

IJOSTHE ◽  
2018 ◽  
Vol 5 (4) ◽  
pp. 7
Author(s):  
Swarnik Mehar ◽  
Pankaj Mishra
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Heat Transfer Rate ◽  
Dissipation Rate ◽  
Transfer Rate ◽  
Heat Dissipation ◽  
Heat Engine ◽  
Total Heat Flow ◽  
Geometrical Condition ◽  
Interesting Task

If the heat in the heat engine is not removed properly, it causes the development of the detonation and eventually reduces the efficiency of the engine, so that the heat dissipation rate of the cylinder an important and interesting task is the option. The cylinder of the engine is one of the most important automotive components, variations of high temperature and thermal loads. To cool the cylinder, the ribs are provided on the surface of the cylinder, to increase the rate of heat transfer. By a thermal analysis of the motor cylinder and the ribs that surround it, it is useful to know the heat transfer rate and the temperature distribution inside the cylinder. We know that we can increase the heat dissipation rate by increasing the surface so it is very difficult to design such a complex motor. The main objective of this project is to analyze thermal properties such as thermal directed flow, total heat flow and temperature distribution. The cooling mechanism of the air cooled engine depends mainly on the design of the cylinder head and the block ribs. The cooling fins are used to increase the heat transfer rate of the specified surface. The life and efficiency of the engine can be improved by efficient cooling. The finite element method was used using the ANSYS software as a simulation tool for analysis.

Measurement of Heat Dissipation Rate Based on Optic-Thermo Oscillations in CaF2 Optical Micro-Cavity

2019 ◽  
Vol 39 (5) ◽  
pp. 0512004
Author(s):  
郭栋 Guo Dong ◽  
邹长铃 Zou Changling ◽  
任宏亮 Ren Hongliang ◽  
卢瑾 Lu Jin ◽  
覃亚丽 Qin Yali ◽  
...  
Keyword(s):  
Dissipation Rate ◽  
Heat Dissipation ◽  
Micro Cavity

Research of Relations between Thermodynamic Quantities of Building Materials in Connection with Heat Dissipation

2015 ◽  
Vol 244 ◽  
pp. 48-53
Author(s):  
Milena Kušnerová ◽  
Jan Valíček ◽  
Vojtěch Václavík ◽  
Marta Harničárová ◽  
Lukáš Gola
Keyword(s):  
Thermal Conductivity ◽  
Heat Flux ◽  
Heat Capacity ◽  
Dissipation Rate ◽  
Building Materials ◽  
Material Parameter ◽  
Heat Dissipation ◽  
Temporal Change ◽  
Point Of View ◽  
Physical Point

This paper proposes the evaluation of material coefficient of heat dissipation rate for building materials, in particular using partial entropies, a temporal change in entropy upon heating a sample of a studied material and a temporal change in entropy upon overheating a sample of a studied material, in order to evaluate the rate of heat dissipation on samples of building materials with thermal insulating properties. From a physical point of view, the material parameter “specific heat capacity” generally refers to the ability of material to “conceive heat” so it can be said that the illustrated material Ytong has a slightly higher specific heat capacity than that of polyurethane. From a physical point of view, the material parameter “thermal conductivity” generally refers to the ability of a given material to “conduct heat through the material in connection with stationary heat flux”, so it can be assumed as well as verified by measuring that Ytong also has a higher thermal conductivity than that of polyurethane. From a physical point of view, the newly proposed material parameter “heat dissipation rate” generally indicates the “rate of heat loss to the external environment in connection with non-stationary heat flux”, so it may also be assumed and verified by measuring that the heat dissipation rate of Ytong will be higher than that of polyurethane.

scholarly journals Heat dissipation rate constrains reproductive investment in a wild bird

2018 ◽  
Vol 33 (2) ◽  
pp. 250-259 ◽  
Author(s):  
Andreas Nord ◽  
Jan‐Åke Nilsson
Keyword(s):  
Dissipation Rate ◽  
Wild Bird ◽  
Heat Dissipation ◽  
Reproductive Investment

Optimization of Cooled Shields in Insulations

1984 ◽  
Vol 106 (4) ◽  
pp. 871-875 ◽  
Author(s):  
J. C. Chato ◽  
J. M. Khodadadi
Keyword(s):  
Dissipation Rate ◽  
Heat Dissipation ◽  
Absolute Temperature ◽  
Entropy Production Rate ◽  
Insulation Layer ◽  
Temperature Ratio ◽  
Insulation System ◽  
Simple Method ◽  
Practical Applications ◽  
Cooling Loads

A relatively simple method has been developed to optimize the location, temperature, and heat dissipation rate of each cooled shield inside an insulation layer. The method is based on the minimization of the entropy production rate, which is proportional to the heat leak across the insulation. The results show that the maximum number of shields to be used in most practical applications is three. However, cooled shields are useful only at low values of the overall, cold wall to hot wall absolute temperature ratio. The performance of the insulation system is relatively insensitive to deviations from the optimum values of temperature and location of the cooling shields. Design curves are presented for rapid estimates of the locations and temperatures of cooling shields in various types of insulations, and an equation is given for calculating the cooling loads for the shields.

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