CFD analysis about surface roughness dependence of thermal contact resistance

2016 ◽  
Author(s):  
Tomoyuki Hatakeyama ◽  
Risako Kibushi ◽  
Masaru Ishizuka
Keyword(s):  
Surface Roughness ◽  
Contact Resistance ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Cfd Analysis

scholarly journals How the Skin Thickness and Thermal Contact Resistance Influence Thermal Tactile Perception

Micromachines ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 87 ◽  
Author(s):  
Congyan Chen ◽  
Shichen Ding
Keyword(s):  
Surface Roughness ◽  
Contact Resistance ◽  
Thermal Model ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Experimental Studies ◽  
Tactile Perception ◽  
Skin Thickness ◽  
Temperature Profiles ◽  
Thermal Perception

A few experimental studies on thermal tactile perception have shown the influence of the thermal contact resistance which relates to contact surface roughness and pressure. In this paper, the theoretical influence of the skin thickness and the thermal contact resistance is studied on the thermal model describing the temperature evolution in skin and materials when they come in contact. The thermal theoretical profile for reproducing a thermal cue for given contact thermal resistance is also presented. Compared to existing models of thermal simulation, the method proposed here has the advantage that the parameters of skin structure and thermal contact resistance in target temperature profiles can be adjusted in thermal perception simulation according to different skin features or surface roughness if necessary. The experimental results of surface roughness recognition were also presented.

Experimental Investigation of Contact Resistance Across Pressed Lead and Aluminum Contact in Vacuum

2000 ◽  
Author(s):  
Xiao Ma ◽  
Jamil A. Khan ◽  
Curtis A. Rhodes ◽  
Allen Smith ◽  
L. Larry Hamm
Keyword(s):  
Surface Roughness ◽  
Experimental Investigation ◽  
Contact Resistance ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Cooling Water ◽  
External Pressure ◽  
Interface Temperature ◽  
Pressure Surface ◽  
Increasing Temperature

Abstract In a proposed nuclear application (production of Tritium using an accelerator, Accelerator Production of Tritium (APT)) lead is proposed to be used as a shield in the blanket module. This lead will be encased in aluminum cladding. The energy transfer rate from the lead to the cooling water will be a function of the thermal contact resistance (TCR) between lead and aluminum. Presently, data for contact resistance for this application does not exists in the literature. An experimental investigation has been conducted to determine the thermal contact resistance between lead and aluminum in vacuum. In this study we investigate the effect of pressure, surface roughness and interface temperature on the contact resistance. The experimentally determined range of contact resistance was found to be from 3.74×10−4K-m2/W to 11.45×10−4K-m2/W at 100°C∼200°C under 120∼370psi (0.827∼2.551MPa). The contact resistance increases to 168×10−4K-m2/W at small external pressure of 2.0∼3.9psi (0.013∼0.027MPa). The contact resistance decreases with increasing in contact pressure. Interface temperature and surface roughness do not affect the contact resistance significantly. There is a slight increase in contact conductance with increasing temperature. The experimental results provide contact resistance data, which should be a good reference for the APT design evaluation.

scholarly journals Effects of surface morphology on thermal contact resistance

2011 ◽  
Vol 15 (suppl. 1) ◽  
pp. 33-38 ◽  
Author(s):  
Haiming Huang ◽  
Xiaoliang Xu
Keyword(s):  
Surface Roughness ◽  
Surface Morphology ◽  
Contact Resistance ◽  
Contact Area ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Average Height ◽  
Morphology Effect ◽  
Linear Manner ◽  
Nominal Contact Area

The thermal contact resistance is common in aerospace industry, nuclear reactors and electronic equipments. The work addresses a new scheme for determining the thermal contact resistance between a smooth surface of a film and a rough surface of a metal specimen. The finite element method was used as a tool to explore the surface morphology effect on the thermal contact resistance while the temperature of the contact surface was determined by a regression method. According to the results developed, the temperature on the contact surfaces linearly drops with the increasing average height of surface roughness and nonlinearly drops with the increasing ratio between non-contact area and nominal contact area. On the other hand, the thermal contact resistance increases linearly with increases in the average height of the surface roughness. What?s more, the thermal contact resistance increases in a non-linear manner as the ratio of the non-contact area to the nominal contact area is increasing.

Experimental Study on Thermal Contact Resistance Improvement for Optical Fiber by Using Low-Melting Temperature Alloy

2019 ◽  
Vol 142 (1) ◽  
Author(s):  
Wen-Xiao Chu ◽  
Hao-Yu Lin ◽  
Chi-Chuan Wang
Keyword(s):  
Surface Roughness ◽  
Optical Fiber ◽  
Contact Resistance ◽  
Melting Temperature ◽  
Contact Pressure ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Thermal Interface Material ◽  
Heating Load ◽  
Effect Of Surface

Abstract This paper presents an experimental analysis for minimizing the thermal contact resistance (R) between an optical fiber and copper heat sink by using the low-melting temperature alloy (LMTA) as the thermal interface material (TIM) subject to high-flux operation (up to 250 W ⋅ m−1). For the cases without LMTA, the temperature rise (ΔT) can easily surpass 195 °C at a heating load of 25 W ⋅ m−1. By contrast, ΔT is dramatically reduced to be less than 1 °C with LMTA as TIM with a much higher heating power of 150 W ⋅ m−1. The corresponding thermal resistance (R) can be reduced from 6.5–8.2 K ⋅ m ⋅ W−1 to 0.004–0.013 K ⋅ m ⋅ W−1. The improvement is far superior to existing studies. Besides, decreasing the surface roughness and increasing contact pressure also help to reduce R, especially for the cases when the LMTA is not melted. As the LMTA melts, a significant reduction of R by 56% is achieved as compared to the case without melting. The effect of surface roughness and contact pressure on the thermal contact resistance is also examined, and it is found that the influences are small once LMTA melts.

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