Comparison of Heat Transfer Theory, CFD and Experimental Results in the Design Process of High-Power Fiber Laser Cooling Plate

For the stabilization of laser output power and wavelength of the high power fiber laser, the cooling plate must be properly taken into account. In this study, three analyzing methods which are heat transfer theory, CFD and experiment are used to analyze cooling plate performance by measuring pump Laser Diode(LD) temperature. Under limited operating conditions of a cooling plate, the internal flow of cooling plate is transitional flow so that the internal flow is assumed to be laminar and turbulence flow and conducted theoretical calculation. Through CFD, temperature of pump LD and characteristics of the internal flow were analyzed. By the experiment, temperature of pump LD was measured in real conditions and the performance of the cooling plate was verified. The results of this study indicate that three analyzing methods are practically useful to design the cooling plate for the high power fiber laser or similar things.

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Analysis of Temperature Field Based on Hollow Sucker Rod Hot Flushing Technology

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1073-1076.2257 ◽

2014 ◽

Vol 1073-1076 ◽

pp. 2257-2262

Author(s):

Jie Yu Du ◽

Jiang Xie ◽

Yu Qi Zhao ◽

Li Peng Zhang ◽

Rui Bin Zhu

Keyword(s):

Heat Transfer ◽

Temperature Field ◽

Low Pressure ◽

Calculation Model ◽

Simulation System ◽

Well Production ◽

Transfer Theory ◽

Heat Transfer Theory ◽

Sucker Rod ◽

Theory Calculation

The hot flushing is a major means of removing wax. For low pressure reservoir, it is possible to produce a large number of washing fluid flowing into the formation, which affects the well production recovery. The application of hollow sucker rod hot flushing technology can avoid fluid pouring back into the formation, and the wells can keep production. Based on the principle of hollow sucker rod hot flushing and heat transfer theory, calculation model of temperature field was established, and hollow sucker rod hot flushing simulation system was developed, which can guide flushing in oilfield.

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Single-Phase Heat Transfer and Pressure Drop of Water Cooled Inside Horizontal Smooth Tubes in the Transitional Flow Regime

2010 14th International Heat Transfer Conference, Volume 2 ◽

10.1115/ihtc14-22338 ◽

2010 ◽

Cited By ~ 1

Author(s):

Josua P. Meyer ◽

Leon Liebenberg ◽

Jonathan A. Olivier

Keyword(s):

Heat Transfer ◽

Reynolds Number ◽

Pressure Drop ◽

Transition Region ◽

Heat Exchangers ◽

Operating Conditions ◽

Transitional Flow ◽

Working Fluid ◽

Tube Heat Exchanger ◽

Smooth Tubes

Heat exchangers are usually designed in such a way that they do not operate in the transition region. This is usually due to a lack of information in this region. However, due to design constraints, energy efficiency requirements or change of operating conditions, heat exchangers are often forced to operate in this region. It is also well known that entrance disturbances influence where transition occurs. The purpose of this paper is to present experimental heat transfer and pressure drop data in the transition region for fully developed and developing flows inside smooth tubes using water as the working fluid. The use of different inlet disturbances were used to investigate its effect on transition. A tube-in-tube heat exchanger was used to perform the experiments, which ranged in Reynolds numbers from 1 000 to 20 000, with Prandtl numbers being between 4 and 6 while Grashof numbers were in the order of 105. Results showed that the type of inlet disturbance could delay transition to a Reynolds number as high as 7 000, while other inlets expedited it, confirming results of others. For heat transfer, though, it was found that transition was independent of the inlet disturbance and all commenced at the same Reynolds number, 2 000–3 000, which was attributed to secondary flow effects.

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