scholarly journals Nanofluids for Heat Transfer – Potential and Engineering Strategies

10.5772/22158 ◽  
2011 ◽  
Author(s):  
Elena V.
Keyword(s):  
Heat Transfer ◽  
Transfer Potential

scholarly journals NODAL COSINE SINE MATERIAL INTERPOLATION IN MULTI OBJECTIVE TOPOLOGY OPTIMIZATION WITH THE GLOBAL CRITERIA METHOD FOR LINEAR ELASTO STATIC, HEAT TRANSFER, POTENTIAL FLOW AND BINARY CROSS ENTROPY SHARPENING

2021 ◽  
Vol 1 ◽  
pp. 2247-2256
Author(s):  
Martin Denk ◽  
Klemens Rother ◽  
Mario Zinßer ◽  
Christoph Petroll ◽  
Kristin Paetzold
Keyword(s):  
Heat Transfer ◽  
Topology Optimization ◽  
Potential Flow ◽  
Cross Entropy ◽  
Objective Criterion ◽  
Multi Objective ◽  
Material Interpolation ◽  
Continuous Material ◽  
Mean Compliance ◽  
Transfer Potential

AbstractTopology optimization is typically used for suitable design suggestions for objectives like mean compliance, mean temperature, or model analysis. Some modern modeling technics in topology optimization require a nodal based material interpolation. Therefore this article is referred to a continuous material interpolation in topology optimization. To cover a smooth and differentiable density field, we address trigonometric shape functions which are infinitely differentiable. Furthermore, we extend a so-known global criteria method with a sharpening function based on binary cross-entropy, so that sharper solutions results. The proposed material interpolation is applied to different applications such as heat transfer, elasto static, and potential flow. Furthermore, these different objectives are together optimized using a multi-objective criterion.

Heat Transfer of Sprays of Large Water Drops Impacting on High Temperature Surfaces

1999 ◽  
Vol 121 (2) ◽  
pp. 446-450 ◽  
Author(s):  
T. L. Cox ◽  
S. C. Yao
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Current Data ◽  
Large Droplet ◽  
Heat Transfer Characteristics ◽  
Maximum Heat ◽  
Maximum Heat Transfer ◽  
Water Drops ◽  
Large Water ◽  
Transfer Potential

Experiments were performed to evaluate the heat transfer of monodisperse sprays of large droplet diameters, ranging from 3 to 25 mm, on high temperature surfaces. This range of drop sizes has not previously been studied, and it was of interest to determine their heat transfer characteristics and how they relate to sprays of smaller drops. Parametric tests showed that the spray heat flux depends on mass flux with a power-law relationship, and that spray effectiveness, which relates the actual spray heat transfer to the maximum heat transfer potential, varies with d−1/2. There was no discernible relationship between the heat transfer and droplet velocity. These results agreed favorably with published results for smaller droplets. The current data was compared to previous tests with smaller droplets using the droplet Reynolds and Weber numbers. This analysis showed some grouping, with a marked separation at We = 80, where the dynamic behavior of droplets has been shown to change for nonwetting impaction.

scholarly journals Heat-Pipe Assisted Thermoelectric Generators for Exhaust Gas Applications

2010 ◽  
Author(s):  
L. M. Goncalves ◽  
Jorge Martins ◽  
Joaquim Antunes ◽  
Romeu Rocha ◽  
Francisco P. Brito
Keyword(s):  
Heat Transfer ◽  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Heat Pipes ◽  
Internal Combustion ◽  
Maximum Temperature ◽  
Thermoelectric Generators ◽  
Exhaust Heat ◽  
Wasted Energy ◽  
Transfer Potential

Millions of hybrid cars are already running on our roads with the purpose of reducing fossil fuel dependence. One of their main advantages is the recovery of wasted energy, namely by brake recovery. However, there are other sources of wasted energy in a car powered by an internal combustion engine, such as the heat lost through the cooling system, lubrication system (oil coolers) and in the exhaust system. These energies can be recuperated by the use of thermoelectric generators (TEG) based on the Seebeck effect, which transform heat directly into electricity. To recover the energy from the hot (up to more than 700 °C) exhaust gases it is possible to use controlled heat transfer, but this would limit the heat transfer potential at partial loads, as commercialy available TEG are limited by their maximum allowable temperature (∼250°C). Therefore Heat Pipes were used as an alternative heat transfer mean, so it would be possible to retain the heat transfer potential, while controlling the maximum temperature at a reasonable level. This is the method to recover the exhaust heat presented in this work. Numerical simulations were performed to assess the potential for this design, involving internal combustion engine simulation, thermoelectric generators simulation and heat transfer modelling. Additionally, the use of variable conductance heat pipes (VCHP) is discussed, as a means of achieving TEG module maximum temperature limitation.

Enhancing Thermophysical Characteristics and Heat Transfer Potential of TiO2/Water Nanofluid

2020 ◽  
Vol 41 (12) ◽  
Author(s):  
Sayantan Mukherjee ◽  
Smita Rani Panda ◽  
Purna Chandra Mishra ◽  
Paritosh Chaudhuri
Keyword(s):  
Heat Transfer ◽  
Thermophysical Characteristics ◽  
Transfer Potential
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