... online August 28, 2018. Assoc. Editor: Ali Khounsary. 15 11 2017 17 07 2018 Gas turbine heat transfer Jets Wakes Impingement Cooling To improve the thermal efficiency of gas turbines, turbine inlet temperature has been increased to a very high level, which is far beyond...

...; final manuscript received February 27, 2018; published online July 23, 2018. Editor: Portonovo S. Ayyaswamy. 08 02 2018 27 02 2018 Experimental techniques Forced convection Gas turbine heat transfer Heat transfer enhancement Jets Wakes Impingement Cooling Gas turbines...

...Dong Hwan Shin; Yeonghwan Kim; Jin Sub Kim; Do Won Kang; Jeong Lak Sohn; Jungho Lee Flow visualization was performed to give a physical insight with vortical structures of an axisymmetric impinging jet on a concave surface. High-speed imaging was employed to get clear images with a laser light...

... Experimental techniques Jets Wakes Impingement Cooling Particles Droplets Copyright © 2018 by ASME 2018 0022-1481/2018/140(8)/080901/1/ $25.00 ...

...Yu Rao A comparative experimental and numerical study has been done on multiple-jet impingement heat transfer in narrow channels with different pin fin configurations on the target surfaces. Three different target plates including a flat plate, a plate with full-height pin fins, and another plate...

...Sang Gun Lee; Jin Sub Kim; Dong Hwan Shin; Jungho Lee The effect of staggered-array water impinging jets on boiling heat transfer was investigated by a simultaneous measurement between boiling visualization and heat transfer characteristics. The boiling phenomena of staggered-array impinging jets...

...Kai Chen; Rui-Na Xu; Pei-Xue Jiang Jet impingement cooling is widely used in many industrial applications due to its high heat transfer capability and is an option for advanced high power density systems. Jet impingement cooling with supercritical pressure fluids could have much larger heat...

... structures at the rear of the bubble associated with the primary heat transfer enhancement and a pair of prominent liquid jets oriented in the transverse direction on either side of the bubble. A single highly confined bubble can have a significant impact on the thermal field both near and several bubble...

...Fatih Selimefendigil; Hakan F. Öztop Numerical study of nanofluid jet impingement cooling of a partially elastic isothermal hot surface was conducted with finite element method. The impingement surface was made partially elastic, and the effects of Reynolds number (between 25 and 200), solid...

... Gas turbine heat transfer Heat and mass transfer Heat transfer enhancement Jets Wakes Impingement Cooling Heat transfer Targets in the design of gas turbine combustors are based on increasing the efficiency of the engine, minimizing the production of the oxides of nitrogen (NO x...

... profile describing how the air–mist coolant jet flow spreads and eventually blends into the hot main flow is prescribed for both cylindrical and fan-shaped holes. The mist film layer consists of two layers: a typical coolant film layer (cooling air containing the majority of the droplets) and a wider...

... and mass transfer Heat transfer enhancement Two-phase flow Jets Wakes Impingement Cooling Heat transfer Because of the difficulty and cost of conducting an experiment at high Reynolds numbers and under elevated pressure and temperature conditions, a computational fluid dynamics simulation...

... number liquid slot jets is not yet comprehensively understood. This investigation experimentally examined jet outlet modifications—in the form of tabs and chevrons—as techniques for passive control and enhancement of single-phase convective heat transfer. The investigation was carried out for slot jets...

...Chinige Sampath Kumar; Arvind Pattamatta An experimental study using the liquid crystal thermography technique is conducted to investigate the convective heat transfer performance in jet impingement cooling using various porous media configurations. Aluminum porous foams are used in the present...

...Mayank Modak; Sandesh S. Chougule; Santosh K. Sahu In the present study, an experimental investigation has been carried out to analyze the heat transfer characteristics of CuO–water nanofluids jet on a hot surface. A rectangular stainless steel foil (AISI-304, 0.15 mm thick) used as the test...

...Alexander S. Rattner In conventional jet impingement array heat sinks, all the spent coolant is extracted from component edges, resulting in cross-flow interference and nonuniform heat transfer. Jet impingement arrays with interspersed fluid extraction ports can reduce cross-flow, improving heat...

.... The blowing ratio is the mass flux ratio between the coolant flow and the mainstream gas flow ( M  =  ρ c V c / ρ α V a ). It reduces to the ratio between the velocity of cooling jets and the freestream velocity for cases in which the density of coolant and mainstream air is almost similar. Approximate...

...Qaiser Sultan; Gildas Lalizel; Matthieu Fénot; Eva Dorignac This study investigates the effects of sinusoidal pulsations externally imposed to an oblique round jet. The effectiveness of film coverage of an adiabatic wall onset for a thermally uniform bulk flow is presented in the perspective of gas...

...Weihong Li; Minghe Xu; Jing Ren; Hongde Jiang Comprehensive impingement heat transfer coefficients data are presented with varied Reynolds number, hole spacing, jet-to-target distance, and hole inclination utilizing transient liquid crystal. The impingement configurations include: streamwise...

... Jets Wakes Impingement Cooling Reactive flows Analysis of boundary layer flow and heat transfer over a stretching sheet has been considered significantly in recent years due to its applications. This problem has many engineering applications in industrial processes, such as polymer industry...