scholarly journals Heat transfer properties of aqueous carbon nanotubes nanofluids in coaxial heat exchanger under laminar regime

2014 ◽  
Vol 55 ◽  
pp. 174-180 ◽  
Author(s):  
Salma Halelfadl ◽  
Patrice Estellé ◽  
Thierry Maré
Keyword(s):  
Heat Transfer ◽  
Carbon Nanotubes ◽  
Heat Exchanger ◽  
Laminar Regime ◽  
Transfer Properties

scholarly journals Thermal transfer of Nanofluids based on carbon nanotubes/glycerol and study of their rheological behavior

2019 ◽  
Vol 286 ◽  
pp. 08003 ◽  
Author(s):  
S. Lahlou ◽  
R. Sehaqui ◽  
N. Lahlou
Keyword(s):  
Heat Transfer ◽  
Carbon Nanotubes ◽  
Heat Exchanger ◽  
Rheological Behavior ◽  
Mass Fraction ◽  
Volume Fraction ◽  
Heat Transfer Fluids ◽  
Thermal Transfer ◽  
The Subject ◽  
Viscoplastic Models

In the field of heat transfer, the use of the properties of rheological behavior inherent to suspensions of nanoparticles in heat transfer fluids has been the subject of several years of work. Our study concerns the particular case of suspensions of multilayered carbon nanotubes (MNTCs) in glycerol. We highlight the effect of the mass fraction φ of (MNTCs) on the rheology of the solutions for 0.1% ≤ φ ≤1%, on the temperature [30-80°C] and the effect on a heat exchanger. The experimental results obtained are described by viscoplastic models for which the yield stress increases with φ. We then propose a law of polynomial evolution of the apparent viscosity as a function of the volume fraction for each value of the shear rate varying from 0s-1 to 100s-1.

A Study on the Heat Transfer in Shell and Tube Heat Exchanger with Various Baffle Types

2015 ◽  
Vol 727-728 ◽  
pp. 453-458
Author(s):  
Jae Hoon Lee ◽  
Si Pom Kim ◽  
Seong Jun Kim
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heating Surface ◽  
Flow Region ◽  
Transfer Performance ◽  
Tube Heat Exchanger ◽  
Design Variables ◽  
Shell And Tube ◽  
Save Energy ◽  
Transfer Properties

Recently, variousresearches and developments of heat exchangers with high thermal efficiencyhave been in progress to save energy. Baffles are used as design variables in a way that enhancesheat transfer performance of shell and tube heat exchanger. There have beenvarious of researches and developments in the relations between baffles andheat transfer performance. Existing studies on shell and tube heat exchangersare mainly about heat transfer properties of either segmental type baffles orhelical baffles. However, there is inadequateof study with comparisons between the two types ofbaffles. Thus, this paper aims to research changes in heat transfer properties according to thenumber of segmental and helical baffles. It shows pressure drop, temperaturedifference of inlet and outlet, heating surface area of inner flow region, andheat transfer coefficient in tubes.

Experimental Research on Resistance and Heat Transfer Properties of Corrugated Plate Air-Cooled Heat Exchanger

2011 ◽  
Vol 354-355 ◽  
pp. 153-158
Author(s):  
Xiao Qing Huang ◽  
Xu Zhang ◽  
Chun Guang Li
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Heat Exchanger ◽  
Experimental Research ◽  
Convection Heat Transfer ◽  
Hot Water ◽  
Water Side ◽  
Coefficient Corrélation ◽  
Air Cooled Heat Exchanger ◽  
Transfer Properties

Experimental research on resistance and heat transfer properties of corrugated plate air-cooled heat exchanger under the condition of variable air and hot water flow rates has been conducted. The pressure drop and convection heat transfer coefficient correlation expressions both the air side and hot water side are acquired, where the Reynolds number for air side ranges from 401 to 6602 and the Reynolds number for water side ranges from 2536 to 19301 are adaptable.

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