A Numerical Simulation of the Thermal Process in Controlled Atmosphere Brazing (CAB) of an Aluminum Heat Exchanger

Numerical Simulation & Experimental Investigation of SMT Laser Microsoldering Thermal Process

MRS Proceedings ◽

10.1557/proc-226-37 ◽

1991 ◽

Vol 226 ◽

Author(s):

Wang Chunqing ◽

Qian Yiyu ◽

Jiang Yihong

Keyword(s):

Thermal Conductivity ◽

Numerical Simulation ◽

Experimental Investigation ◽

Thermal Process ◽

Light Wave ◽

Light Reflection ◽

Lead Wire ◽

Wire Surface ◽

Conductivity Variation ◽

Thermal Conductivity Variation

AbstractIn this paper,a numerical simulation of thermal process in the SMT laser microsoldering joint has been developed, in which, the influence on thermal process of the factors such as the thermal conductivity variation of solder with temperature, light reflection coefficient of the lead wire surface, and heat exchange on the surface of SMT materials all have been considered. In order to carry this numerical calculation practice and prove it's results,the reflexive characteristic of light wave to the SMT materials has been gauged,and the dynamic temperature process of laser microjoint has been measured by a new experimental method which was invented by the authors.The results of numerical simulation have been borne out by the tests, and the influences of heating parameters on thermal process has been analysed in this paper.The conclusions will be advantageous to the further study of the microjoint quality control in the SMT laser microsoldering.

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Calculation and Design Method Study of the Coil-Wound Heat Exchanger

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1008-1009.850 ◽

2014 ◽

Vol 1008-1009 ◽

pp. 850-860 ◽

Cited By ~ 3

Author(s):

Zhou Wei Zhang ◽

Jia Xing Xue ◽

Ya Hong Wang

Keyword(s):

Heat Transfer ◽

Numerical Simulation ◽

Heat Exchanger ◽

Design Method ◽

Fluid Velocity ◽

Exchange Process ◽

Three Dimensional ◽

Simulation Method ◽

Physical Parameters ◽

Numerical Result

A calculation method for counter-current type coil-wound heat exchanger is presented for heat exchange process. The numerical simulation method is applied to determine the basic physical parameters of wound bundles. By controlling the inlet fluid velocity varying in coil-wound heat exchanger to program and calculate the iterative process. The calculation data is analyzed by comparison of numerical result and the unit three dimensional pipe bundle model was built. Studies show that the introduction of numerical simulation can simplify the pipe winding process and accelerate the calculation and design of overall configuration in coil-wound heat exchanger. This method can be applied to the physical modeling and heat transfer calculation of pipe bundles in coil wound heat exchanger, program to calculate the complex heat transfer changing with velocity and other parameters, and optimize the overall design and calculation of spiral bundles.

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