SURFACE HEAT TRANSFER CHARACTERISTICS DURING TRANSIENT SPRAY COOLING

2017 ◽  
Author(s):  
Jiameng Tian ◽  
Bin Chen ◽  
Dong Li ◽  
Zhi-Fu Zhou
Keyword(s):  
Heat Transfer ◽  
Spray Cooling ◽  
Surface Heat ◽  
Heat Transfer Characteristics ◽  
Surface Heat Transfer ◽  
Transfer Characteristics

Windows-Based Portable Laboratory System for Demonstrating Heat Transfer From an Extended Surface

2001 ◽  
Author(s):  
Mohammad Khosrowjerdi ◽  
Said Dini ◽  
James Aflaki
Keyword(s):  
Heat Transfer ◽  
Radiation Heat Transfer ◽  
Surface Heat ◽  
Laboratory System ◽  
Heat Transfer Characteristics ◽  
Surface Heat Transfer ◽  
Service Unit ◽  
Transfer Characteristics ◽  
Laboratory Courses ◽  
Extended Surface

Abstract An Armfield™ small bench top service unit (HT10X) in conjunction with an extended surface heat transfer assembly (HT15) are utilized to demonstrate the temperature profile and heat transfer characteristics of a cylindrical rod. Heat flows along the rod by conduction and is lost to the surroundings by combined natural convection and radiation. This well-instrumented laboratory teaching equipment allows students to measure the temperature distribution along the rod and compare the result with a theoretical analysis. Also, heat transfer from the extended surface resulting from the combined modes of free convection and radiation heat transfer is investigated. A self-contained Windows-based data collection and analysis system has been developed for automating all the manual functions of the Armfield™ extended surface heat transfer assembly; HT15. This system uses an inexpensive plug-in data acquisition board to read the voltage signals corresponding to nine K-type thermocouples and heater supplied voltage and current. The user interface software that is written in Visual Basic 6 uses 32-bit libraries to control the heater voltage and read the thermocouples voltages and heater supplied voltage and current. Used in conjunction with the HT15 unit, the software is a valuable teaching tool for instructors and provides a comprehensive learning environment within which heat transfer characteristics can be studied. It is aimed at enhancing the students understanding of one dimensional heat conduction along a cylindrical rod and enabling them to contrast theory and practical measurements of temperatures. It is also the intent of this paper to discuss the successful integration of this educational system into portable instructional technology for the classroom and the mechanical engineering laboratory courses.

Full surface heat transfer characteristics of rotor ventilation duct of a turbine generator

2016 ◽  
Vol 94 ◽  
pp. 385-394 ◽  
Author(s):  
Wonkyung Yoo ◽  
Shinyoung Jeon ◽  
Changmin Son ◽  
Jangsik Yang ◽  
Daihyun Ahn ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Surface Heat ◽  
Heat Transfer Characteristics ◽  
Turbine Generator ◽  
Surface Heat Transfer ◽  
Transfer Characteristics ◽  
Ventilation Duct

Heat Transfer Characteristics of Downward Facing Hot Horizontal Surfaces Using Mist Jet Impingement

2017 ◽  
Author(s):  
Ashutosh Kumar Yadav ◽  
Parantak Sharma ◽  
Avadhesh Kumar Sharma ◽  
Mayank Modak ◽  
Vishal Nirgude ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Surface Heat Flux ◽  
Cooling System ◽  
Water Pressure ◽  
Jet Impingement ◽  
Surface Heat ◽  
Heat Transfer Characteristics ◽  
Impingement Cooling ◽  
Transfer Characteristics

Impinging jet cooling technique has been widely used extensively in various industrial processes, namely, cooling and drying of films and papers, processing of metals and glasses, cooling of gas turbine blades and most recently cooling of various components of electronic devices. Due to high heat removal rate the jet impingement cooling of the hot surfaces is being used in nuclear industries. During the loss of coolant accidents (LOCA) in nuclear power plant, an emergency core cooling system (ECCS) cool the cluster of clad tubes using consisting of fuel rods. Controlled cooling, as an important procedure of thermal-mechanical control processing technology, is helpful to improve the microstructure and mechanical properties of steel. In industries for heat transfer efficiency and homogeneous cooling performance which usually requires a jet impingement with improved heat transfer capacity and controllability. It provides better cooling in comparison to air. Rapid quenching by water jet, sometimes, may lead to formation of cracks and poor ductility to the quenched surface. Spray and mist jet impingement offers an alternative method to uncontrolled rapid cooling, particularly in steel and electronics industries. Mist jet impingement cooling of downward facing hot surface has not been extensively studied in the literature. The present experimental study analyzes the heat transfer characteristics a 0.15mm thick hot horizontal stainless steel (SS-304) foil using Internal mixing full cone (spray angle 20 deg) mist nozzle from the bottom side. Experiments have been performed for the varied range of water pressure (0.7–4.0 bar) and air pressure (0.4–5.8 bar). The effect of water and air inlet pressures, on the surface heat flux has been examined in this study. The maximum surface heat flux is achieved at stagnation point and is not affected by the change in nozzle to plate distance, Air and Water flow rates.

scholarly journals Radial and temporal variations in surface heat transfer during cryogen spray cooling

2005 ◽  
Vol 50 (2) ◽  
pp. 387-397 ◽  
Author(s):  
Walfre Franco ◽  
Jie Liu ◽  
Guo-Xiang Wang ◽  
J Stuart Nelson ◽  
Guillermo Aguilar
Keyword(s):  
Heat Transfer ◽  
Spray Cooling ◽  
Temporal Variations ◽  
Surface Heat ◽  
Surface Heat Transfer ◽  
Cryogen Spray Cooling
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