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Wettability Effects on Falling Film Flow and Heat Transfer Over Horizontal Tubes in Jet Flow Mode
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The performance of a falling-film heat exchanger is strongly linked to the surface characteristics and the heat transfer processes that take place over the tubes. The primary aim of this numerical study is to characterize ...
Bend Geometries in Internal Cooling Channels for Improved Thermal Performance
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The pressure drop and heat transfer in a two pass internal cooling channel with two different bend geometries is experimentally studied with the goal of improving the thermal performance factor (TPF) in the coolant channel. ...
Effect of Bend Geometry on Heat Transfer and Pressure Drop in a Two Pass Coolant Square Channel for a Turbine
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper presents a comparative numerical study of turbulent flow inside a twopass internal cooling channel with different bend geometries. The goal is to find a geometry that reduces the bend related pressure loss and ...
Turbine Blade Tip Film Cooling With Blade Rotation—Part I: Tip and Pressure Side Coolant Injection
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: An experimental study of film cooling is conducted on the tip of a turbine blade with a blade rotation speed of 1200 rpm. The coolant is injected from the blade tip and pressure side (PS) holes, and the effect of the ...
Turbine Blade Tip Cooling With Blade Rotation—Part II: Shroud Coolant Injection
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this paper, blade tip cooling is investigated with coolant injection from the shroud alone and a combination of shroud coolant injection and tip cooling. With a nominal rotation speed of 1200 rpm, each blade consists ...
Improved Film Cooling Effectiveness With a Round Film Cooling Hole Embedded in a Contoured Crater
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Studies of film cooling holes embedded in craters and trenches have shown significant improvements in the film cooling performance. In this paper, a new design of a round film cooling hole embedded in a contoured crater ...
Heat Transfer Enhancement Using Angled Grooves as Turbulence Promoters
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: An experimental study is conducted on a simulated internal cooling channel of a turbine airfoil using angled grooves and combination of groovesribs to enhance the heat transfer from the wall. The grooves are angled at 45 ...
Modal Analysis of Inclined Film Cooling Jet Flow
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Thermal and hydrodynamic flow field over a flat surface cooled with a single round inclined film cooling jet and fed by a plenum chamber is numerically investigated using large eddy simulation (LES) and validated with ...
Numerical Study of the Flow Past a Turbine Blade Tip: Effect of Relative Motion Between Blade and Shroud
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Turbine blade tips are often the most susceptible to material failure due to the highspeed leakage flow and associated large thermal loadings. In this paper, the effect of the blade rotation and relative motion between the ...
Flame Dynamics With Hydrogen Addition at Lean Blowout Limits
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Lean premixed combustion is widely used in power generation due to low nitric oxide emissions. Recent interest in syngas requires a better understanding of the role of hydrogen addition on the combustion process. In the ...