Experimental Study on Heat Transfer and Thermo-Physical Properties of Covalently Functionalized Carbon Nanotubes Nanofluids in an Annular Heat Exchanger: A Green and Novel Synthesis

2017 ◽  
Vol 31 (5) ◽  
pp. 5635-5644 ◽  
Author(s):  
Maryam Hosseini ◽  
Rad Sadri ◽  
Salim Newaz Kazi ◽  
Samira Bagheri ◽  
Nashrul Zubir ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Carbon Nanotubes ◽  
Experimental Study ◽  
Heat Exchanger ◽  
Physical Properties ◽  
Functionalized Carbon Nanotubes ◽  
Novel Synthesis ◽  
Thermo Physical Properties

Parametric and Uncertainty Study of a Counter Current LBE-Water Heat Exchanger With TRACE and SUSA

2012 ◽  
Author(s):  
Wadim Jäger ◽  
Victor Sánchez ◽  
Diego Castelliti
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Heat Exchanger ◽  
Physical Properties ◽  
Oxide Layer ◽  
Sensitivity Study ◽  
Physical Models ◽  
Transfer Model ◽  
Counter Current ◽  
Thermo Physical Properties

Due to the variety of existing physical models for the heat transfer and for the description of thermo physical properties, the modeling results of different users for the same design can be different. These discrepancies can be rather big and have therefore a big impact on the thermo hydraulic performance of the investigated design proposals, in the present case a LBE-water counter current heat exchanger. A parametric, and a subsequent uncertainty and sensitivity study, is performed with different LBE to wall heat transfer models and different sets of the thermo physical properties of the heat exchanger material, steel and oxide layer. The investigations reveal that with best practice models the transferred power of the investigated heat exchanger design can range from 26 MW to 31 MW, with a target value of 27.5 MW. For the parametric study the thermal conductivity range of the oxide has the biggest impact on the results while for the uncertainty analysis the heat transfer model and the thermal conductivity of the oxide layer are of importance.

Experimental Study of Thermo-Physical Properties of Nanofluids Based on γ-Fe2O3Nanoparticles for Heat Transfer Applications

2016 ◽  
Vol 38 (17) ◽  
pp. 1496-1505 ◽  
Author(s):  
Gabriela Huminic ◽  
Angel Huminic ◽  
Florian Dumitrache ◽  
Claudiu Fleaca ◽  
Ion Morjan
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Physical Properties ◽  
Thermo Physical Properties

Heat Transfer and Crystallization Modeling during Compression Molding of Thermoplastic Composite Parts

2015 ◽  
Vol 651-653 ◽  
pp. 1507-1512 ◽  
Author(s):  
Jalal Faraj ◽  
Baptiste Pignon ◽  
Jean Luc Bailleul ◽  
Nicolas Boyard ◽  
Didier Delaunay ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Physical Properties ◽  
Volume Fraction ◽  
Thermoplastic Composite ◽  
Large Temperature ◽  
Process Conditions ◽  
Thermoplastic Resin ◽  
Whole Process ◽  
Low Viscosity ◽  
Thermo Physical Properties

We present in this paper, the coupling of heat transfer to the crystallization of composite in a closed mold. The composite is based on thermoplastic resin (low viscosity PA 66) with glass fiber (50% volume fraction). In order to realize this coupling, an accurate characterizationof thermo physical properties in process conditions, especially in the molten and solid state is needed. In addition, theidentification of the parameters of crystallization kinetics is required. Therefore, we present the methods that were used to study the thermo physical properties as the thermal conductivity, heat capacity and the specific volume. Moreover, the kinetic of crystallization was estimated over a large temperature range by using Flash DSC and classical DSC. In order to validate the measurements, the whole process was modeled by finite elements. The model includes the resolution of the strong coupling between the heat transfer and crystallization. Finally, the experimental and numerical results were compared.

Numerical Simulation of Bubble Growth During Nanofluid Flow Boiling in a Microchannel

2014 ◽  
Author(s):  
Arman Khalighi ◽  
Matthew Blomquist ◽  
Abhijit Mukherjee
Keyword(s):  
Heat Transfer ◽  
Physical Properties ◽  
Heat Dissipation ◽  
Flow Boiling ◽  
Contact Angles ◽  
Electronic Systems ◽  
Simulation Based ◽  
Fluid Media ◽  
Thermo Physical Properties ◽  
Current Heat

In recent years, heat dissipation in micro-electronic systems has become a significant design limitation for many component manufactures. As electronic devices become smaller, the amount of heat generation per unit area increases significantly. Current heat dissipation systems have implemented forced convection with both air and fluid media. However, nanofluids may present an advantageous and ideal cooling solution. In the present study, a model has been developed to estimate the enhancement of the heat transfer when nanoparticles are added to a base fluid, in a single microchannel. The model assumes a homogeneous nanofluid mixture, with thermo-physical properties based on previous experimental and simulation based data. The effect of nanofluid concentration on the dynamics of the bubble has been simulated. The results show the change in bubble contact angles due to deposition of the nanoparticles has more effect on the wall heat transfer compared to the effect of thermo-physical properties change by using nanofluid.

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