scholarly journals Cooldown of Subsea Deadleg With a Cold Spot: Experimental and Numerical Heat-Transfer Analysis

2016 ◽  
Vol 5 (06) ◽  
Author(s):  
Ola Hagemann ◽  
Atle Jensen ◽  
Stig Grafsrønningen
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Analysis ◽  
Cold Spot ◽  
Numerical Heat Transfer

scholarly journals Numerical heat transfer analysis of micro-scale jet-impingement cooling in a high-pressure turbine vane

2021 ◽  
Author(s):  
Karan Anand
Keyword(s):  
Heat Transfer ◽  
Three Dimensional ◽  
Jet Impingement ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Heat Transfer Analysis ◽  
Transfer Rates ◽  
Numerical Heat Transfer ◽  
Turbine Vane ◽  
Single Jet

This research provides a computational analysis of heat transfer due to micro jet-impingement inside a gas turbine vane. A preliminary-parametric analysis of axisymmetric single jet was reported to better understand micro jet-impingement. In general, it was seen that as the Reynolds number increased the Nusselt number values increased. The jet to target spacing had a considerably lower impact on the heat transfer rates. Around 30% improvement was seen by reducing the diameter to half while changing the shape to an ellipse saw 20.8% improvement in Nusselt value. The numerical investigation was then followed by studying the heat transfer characteristics in a three-dimensional, actual-shaped turbine vane. Effects of jet inclination showed enhanced mixing and secondary heat transfer peaks. The effect of reducing the diameter of the jets to 0.125 mm yielded 55% heat transfer improvements compared to 0.51 mm; the tapering effect also enhanced the local heat transfer values as local velocities at jet exit increased.

Numerical Heat Transfer Analysis of Flake Ice Storage System with Nanofluids

2012 ◽  
Vol 433-440 ◽  
pp. 2716-2720
Author(s):  
Jing De Zhao ◽  
Ni Liu ◽  
Yi Wang
Keyword(s):  
Heat Transfer ◽  
Numerical Model ◽  
Storage System ◽  
Heat Transfer Analysis ◽  
Ice Storage ◽  
Electrical Load ◽  
Unsteady Heat Transfer ◽  
Numerical Heat Transfer

Ice Storage air-condition can be used to shift electrical load from on-peak hours to off-peak hours, which can bring mutual benefits to power supplier and consumers. An unsteady heat transfer numerical model is developed to predict the increment of thickness of ice layer of flake ice storage system with Cu-H2O nanofluids solidification. In this study, the speed of increment of ice layer of water and Cu-H2O nanofluids are compared.

A Semi–Computational Method to Predict Body Temperatures in an Automotive Paint Bake Oven

2011 ◽  
Author(s):  
Preetham Rao ◽  
Sreekanth Teeparthi
Keyword(s):  
Heat Transfer ◽  
Time History ◽  
Computational Method ◽  
Heat Transfer Analysis ◽  
Paint Shop ◽  
Numerical Heat Transfer ◽  
Automotive Paint ◽  
Automotive Assembly ◽  
Complicated Geometry ◽  
Comparison Of The Results

The skeleton of a vehicle, known as a Body in White (BiW), with hundreds of sheet metal components is painted in an automotive assembly paint shop. Multiple ovens are used to bake and cure the layers of paint put on the BiW in a paint shop. These ovens are hundreds of feet long and impart heat to a BiW using radiation and convection modes. Prediction of temperature–time history at different locations of a BiW as it passes through a paint bake oven is important to understand the quality of the cured paint. This paper describes a method to predict the same using Computational Fluid Dynamics (CFD) and numerical heat transfer methods, combined with a single generic measurement from the oven. The flow field and the convection parameters around the BiW are obtained from a few quasi-steady CFD simulations of the BiW in the oven. A detailed temperature map on a BiW is then obtained by coupling the CFD results to a transient heat transfer analysis with a moving model of the BiW inside the oven in a thermal nodal network solver. Comparison of the results from the simulation of an actual vehicle and proposed improvements are discussed. The coupled simulation approach is shown to result in a reasonable level of accuracy within acceptable timelines for such a multi-scale physical problem with a highly complicated geometry.

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