Prediction of electronic component-board transient conjugate heat transfer

Eveloy, Valérie; Rodgers, Peter

doi:10.1109/tcapt.2005.848586

Cited by 14 publications

(5 citation statements)

References 48 publications

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“…Convection reflow ovens do not contain infra-radiation tubes and the inside of the ovens are made from polished stainless steel which means that their emissivity is very low ($0.1), so the convection heat flow rate is much bigger than the radiation heat flow rate. Therefore, we can neglect the radiation heat during the measurements [16][17][18].…”

Section: Methodsmentioning

confidence: 99%

“…Only a limited number of publications deal with convection reflow ovens, and unfortunately these contain mistakes. Eveloy et al [17,18] and Powell [19] built CFD models for special convection reflow ovens, but these totally differed in construction to the reflow ovens applied in mass production. In addition, Eveloy studied the temperature interval between 50 and 80°C, which is a too low temperature in the case of reflow soldering.…”

Section: Introductionmentioning

confidence: 99%

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Investigating direction characteristics of the heat transfer coefficient in forced convection reflow oven

Illés

Harsányi

2009

Experimental Thermal and Fluid Science

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigating direction characteristics of the heat transfer coefficient in forced convection reflow oven

Illés

Harsányi

2009

Experimental Thermal and Fluid Science

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“…Convection reflow ovens do not contain infra-radiation tubes and the inside of the ovens are made from polished stainless steel which means that their emissivity is very low (~0.1), therefore we can neglect the radiation heat [16][17][18].…”

Section: The Measuring Systemmentioning

confidence: 99%

“…Only a limited number of publications deal with convection reflow ovens, and unfortunately these contain mistakes. Eveloy [17,18] and Powel [19] built CFD models for special convection reflow ovens, but these totally differed in construction to the reflow ovens applied in mass production. In addition, Eveloy studied the temperature interval between 50 and 80°C, which is a too low temperature in the case of reflow soldering.…”

Section: Introductionmentioning

confidence: 99%

Heating characteristics of convection reflow ovens

Illés¹,

Harsányi²

2009

Applied Thermal Engineering

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Abstract:The inhomogeneous temperature distribution in the reflow oven can cause soldering failures. In this project, we investigate how the construction of a convection reflow oven has an affect on its heating characteristics. In the convection reflow oven itself, the heating capability is mainly dependent on the heat transfer coefficient, which in turn is mostly determined by the gas flow parameters. Therefore, we study how the construction of the reflow oven affects the flow of gas in the oven. Our conclusions are then verified with experimental results. During our experiments, temperature changes were measured at different points located around the centre of the processing area in the oven. From this data, the 3D directional characteristics of the heat transfer coefficient was calculated using the heat equation of the investigated reflow oven. We consider that our results are important for the effective thermal modelling of the reflow soldering process [1] and are also useful when calibrating and designing reflow ovens. During our work, we examine the latest reflow ovens constructed with the nozzle-matrix blower system.

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“…The Temperature Field Solution Method of Concrete 2.1 Air-Concrete Conjugate Heat Transfer TheoryThe conjugate heat transfer theory first emerged in simulation research on electronic components, wings, engines, and other heat dissipation components[40]. Owing to the large volume of hydraulic structures, heat exchange with air primarily occurs through natural convection heat dissipation after concrete pouring.…”

mentioning

confidence: 99%

Calculation of Mass Concrete Temperature and Creep Stress under the Influence of Local Air Heat Transfer

Zhang,

Su,

Chen

et al. 2024

CMES

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Temperature-induced cracking during the construction of mass concrete is a significant concern. Numerical simulations of concrete temperature have primarily assumed that the concrete is placed in an open environment. The problem of heat transfer between the air and concrete has been simplified to the concrete's heat dissipation boundary. However, in the case of tubular concrete structures, where air inlet and outlet are relatively limited, the internal air temperature does not dissipate promptly to the external environment as it rises. To accurately simulate the temperature and creep stress in tubular concrete structures with enclosed air spaces during construction, we establish an air-concrete coupled heat transfer model according to the principles of conjugate heat transfer, and the accuracy of the model is verified through experiments. Furthermore, we conduct a case study to analyze the impact of airflow within the ship lock corridor on concrete temperature and creep stress. The results demonstrate that enhancing airflow within the corridor can significantly reduce the maximum concrete temperature. Compared with cases in which airflow within the corridor is neglected, the maximum concrete temperature and maximum tensile stress can be reduced by 12.5°C and 0.7 MPa, respectively, under a wind speed of 4 m/s. The results of the traditional calculation method are relatively close to those obtained at a wind speed of 1 m/s. However, the temperature reduction process in the traditional method is faster, and the method yields greater tensile stress values for the corridor location. KEYWORDSConjugate heat transfer; temperature field; mass concrete; creep stress 1 IntroductionCurrently, the global annual volume of poured concrete exceeds 200,000 tons [1]. Various factors contribute to the susceptibility of mass concrete to cracking during construction, which directly reduces the bearing capacity, durability, and waterproofing of structures. Generally, the factors influencing concrete crack formation can be categorized into two groups: internal and external. Regarding internal factors, temperature stress is the primary cause of crack formation. The temperature difference

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Prediction of electronic component-board transient conjugate heat transfer

Cited by 14 publications

References 48 publications

Investigating direction characteristics of the heat transfer coefficient in forced convection reflow oven

Investigating direction characteristics of the heat transfer coefficient in forced convection reflow oven

Heating characteristics of convection reflow ovens

Calculation of Mass Concrete Temperature and Creep Stress under the Influence of Local Air Heat Transfer

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