An Inverse Data Analysis Technique for the Determination of Local Heat Transfer Phenomena

2007 ◽  
Author(s):  
Michael Cochran ◽  
Bruce Babin ◽  
Sanjoy Das
Keyword(s):  
Heat Transfer ◽  
Data Analysis ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Data Analysis Technique ◽  
Analysis Technique

scholarly journals Systematic Investigation on Conjugate Heat Transfer Rates of Film Cooling Configurations

2005 ◽  
Vol 2005 (3) ◽  
pp. 211-220 ◽  
Author(s):  
Dieter Bohn ◽  
Jing Ren ◽  
Karsten Kusterer
Keyword(s):  
Heat Transfer ◽  
Film Cooling ◽  
Conjugate Heat Transfer ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Systematic Investigation ◽  
Transfer Condition ◽  
Film Cooling Effectiveness ◽  
Conjugate Calculation

For the determination of the film-cooling heat transfer, the design of a turbine blade relies on the conventional determination of the adiabatic film-cooling effectiveness and heat transfer conditions for test configurations. Thus, additional influences by the interaction of fluid flow and heat transfer and influences by additional convective heat transfer cannot be taken into account with sufficient accuracy. Within this paper, calculations of a film-cooled duct wall and a film-cooled real blade with application of the adiabatic and a conjugate heat transfer condition have been performed for different configurations. It can be shown that the application of the conjugate calculation method comprises the influence of heat transfer within the cooling film. The local heat transfer rate varies significantly depending on the local position.

Influence of High Rotational Speeds on Heat Transfer and Oil Film Thickness in Aero-Engine Bearing Chambers

1994 ◽  
Vol 116 (2) ◽  
pp. 395-401 ◽  
Author(s):  
S. Wittig ◽  
A. Glahn ◽  
J. Himmelsbach
Keyword(s):  
Heat Transfer ◽  
Film Thickness ◽  
Thermal Loading ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Test Facility ◽  
High Rotational Speed ◽  
Oil Film ◽  
Aero Engine

Increasing the thermal loading of bearing chambers in modern aero-engines requires advanced techniques for the determination of heat transfer characteristics. In the present study, film thickness and heat transfer measurements have been carried out for the complex two-phase oil/air flow in bearing chambers. In order to ensure real engine conditions, a new test facility has been built up, designed for rotational speeds up to n = 16,000 rpm and maximum flow temperatures of Tmax = 473 K. Sealing air and lubrication oil flow can be varied nearly in the whole range of aero-engine applications. Special interest is directed toward the development of an ultrasonic oil film thickness measuring technique, which can be used without any reaction on the flow inside the chamber. The determination of local heat transfer at the bearing chamber housing is based on a well-known temperature gradient method using surface temperature measurements and a finite element code to determine temperature distributions within the bearing chamber housing. The influence of high rotational speed on the local heat transfer and the oil film thickness is discussed.

scholarly journals KEEFEKTIFAN PROGRAM INDONESIA PINTAR DI MADRASAH KABUPATEN GORONTALO

2020 ◽  
Vol 4 (1) ◽  
pp. 48-58
Author(s):  
Syafrin Ngiode ◽  
Alfian Erwinsyah
Keyword(s):  
Mixed Methods ◽  
Data Analysis ◽  
Data Collection ◽  
Educational Needs ◽  
Prospective Students ◽  
Component Score ◽  
Data Analysis Technique ◽  
Analysis Technique ◽  
Output Component

This study aims to determine the effectiveness of the Smart Indonesia Program (PIP) in madrasah, Gorontalo District, Gorontalo Province. This research uses mixed methods. Data collection techniques carried out through observation, interviews, questionnaires, and documentation. The data analysis technique is done in stages, starting from editing, coding tabulating, scoring to drawing conclusions. The results showed that: Input component score is 87 (effective), consisting of guidelines book, objectives, program objectives, PIP recipient requirements, student allocation, fund amount, determination of prospective students receiving assistance, submission of PIP recipients, PIP program funds distribution and withdrawal, realization of PIP disbursement and reporting, are considered effective, because their implementation refers to the technical guidelines for the implementation of the Smart Indonesia Program in madrasah. Output component score of 90 (effective). The indicators on the use of funds are considered effective, because students have used them well to meet their educational needs. The PIP recipient's liability indicator is in the effective category, because in PIP acceptance, madrasah students have an obligation to report the value of their semester results, PIP will be canceled if the requirements are not met.

Conjugate Heat Transfer Analysis for Film Cooling Configurations With Different Hole Geometries

2003 ◽  
Author(s):  
Dieter Bohn ◽  
Jing Ren ◽  
Karsten Kusterer
Keyword(s):  
Heat Transfer ◽  
Film Cooling ◽  
Conjugate Heat Transfer ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Secondary Flows ◽  
Heat Transfer Analysis ◽  
Transfer Condition ◽  
Film Cooling Effectiveness

Secondary flows in the cooling jets are the main reason for the degradation of the cooling performance of a film-cooled blade. The formation of kidney vortices can significantly be reduced for shaped holes instead of cylindrical holes. For the determination of the film cooling heat transfer, the design of a turbine blade relies on the conventional determination of the adiabatic film cooling effectiveness and heat transfer conditions for test configurations. Thus, additional influences by the interaction of fluid flow and heat transfer and influences by additional convective heat transfer cannot be taken into account with sufficient accuracy. Within this paper, calculations of a film-cooled duct wall with application of the adiabatic and a conjugate heat transfer condition have been performed for different configurations with cylindrical and shaped holes. It can be shown that the application of the conjugate calculation method comprises the influence of heat transfer on the velocity field within the cooling film. In particular, the secondary flow velocities are affected by the local heat transfer, which varies significantly depending on the local position.

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