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Analysis of Moisture and Natural Convection Inside an Automotive Headlamp by Using CFD
Technical Paper
2005-01-1449
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Since an automotive headlamp is very complicated structure, CFD (Computational Fluid Dynamics) had the problem of being very difficult. Especially, if radiation is taken into consideration, the memory required for calculation is huge.
In the present study, the first aim was to develop the new calculation technology that was called FSI-DM, that is a unique technique, in which the calculation mesh generated in the fluid were made discontinuous on the solid and fluid surface. In this FSI-DM, radiative heat transfer was calculated with using the coarse mesh generated on the solid surface to reduce memory size in order to use practical, and it enable us to predict velocity and temperature on the inner parts of an automotive headlamp comparatively accurately.
Next, FSI-DM was further extended so that it would be able to be applied for moisture condensation on the lens surface. In order to express moisture condensation, moisture transfer model was developed using analogy that was formed between the temperature equation and the diffusion equation. This analogy model for moisture was applied to the spherical lamp and actual headlamp with a complicated structure, and it shows that plastic which was constitute headlamp emits moisture when lighting the bulb and that misting occurs when the lens surface is rapidly cooled. Furthermore, the same thing checked also in the experiment qualitatively but quantitative evaluation.
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Authors
- Touichirou Shiozawa - Koito Manufacturing Co., Ltd
- Makoto Ohishi - Koito Manufacturing Co., Ltd
- Masatoshi Yoneyama - Koito Manufacturing Co., Ltd
- Koichi Sakakibara - Koito Manufacturing Co., Ltd
- Shuichi Goto - Koito Manufacturing Co., Ltd
- Norihisa Tsuda - Nippon Steel Corporation
- Toshio Kobayashi - Japan Automobile Research Institute and University of Tokyo
Citation
Shiozawa, T., Ohishi, M., Yoneyama, M., Sakakibara, K. et al., "Analysis of Moisture and Natural Convection Inside an Automotive Headlamp by Using CFD," SAE Technical Paper 2005-01-1449, 2005, https://doi.org/10.4271/2005-01-1449.Also In
SAE 2005 Transactions Journal of Passenger Cars: Mechanical Systems
Number: V114-6; Published: 2006-02-01
Number: V114-6; Published: 2006-02-01
References
- Shiozawa, T. et al. SAE paper 2001-01-0860 2001
- Fukai, S. SAE paper 2001-01-0862 2001
- Shapiro, A.B. An informal Lawrence Livermore Laboratory Report 1983
- Goral, C.M. et al. Computer Graphics 18 3 1984 213 222
- Cohen, M.F. et al. Computer Graphics 19 3 1985 31 40
- Glass, M.W. Sandia National Laboratories Report SAND94-0840 1994
- Emery, A.F. et al. AIAA/ASME/ASCE/ASH 29th SDM Conference, AIAA Paper (1988), 88-2223
- Holman, J.P. Heat Transfer 1989 591 McGraw-Hill