Heat transfer and field synergy characteristics in a rectangular unit channel under mechanical vibration
Fu, Jiahong LU ; Miao, Xu ; Zuo, Qiang ; Tang, Huiping ; Li, Yong LU
; Zhang, Yu
LU
and Sunden, Bengt
LU
(2022)
In International Communications in Heat and Mass Transfer
136.
- Abstract
The internal heat exchangers of a vehicle in driving are excited by forced vibration due to road bumps. But the effect of this phenomenon on the thermal-hydraulic performance of the heat exchanger has not been systematically studied. To investigate the influence of this vibration on the heat transfer characteristics, a numerical model of the rectangular heat exchanger unit channel under vibration excitation was established and verified by experiments. It is found that compared to frequency, amplitude of vibration has a greater effect in enhancing heat transfer but when it is more than 4 mm, which leads to a rapid increase in the friction factor f. An index (j/js)/(f/fs) and a thermal-vibration performance factor... (More)
The internal heat exchangers of a vehicle in driving are excited by forced vibration due to road bumps. But the effect of this phenomenon on the thermal-hydraulic performance of the heat exchanger has not been systematically studied. To investigate the influence of this vibration on the heat transfer characteristics, a numerical model of the rectangular heat exchanger unit channel under vibration excitation was established and verified by experiments. It is found that compared to frequency, amplitude of vibration has a greater effect in enhancing heat transfer but when it is more than 4 mm, which leads to a rapid increase in the friction factor f. An index (j/js)/(f/fs) and a thermal-vibration performance factor (TVPF) considering the frequency and amplitude are proposed to evaluate the effect of vibration on the heat transfer, and it is indicated that for real vehicle operation, an amplitude of 2 mm and frequency of 25 Hz can effectively enhance heat transfer. Besides, it was found that the velocity gradient field perpendicular to the main flow direction caused by vibration synergizes with the temperature gradient field. This work is meaningful and of significance to the practical design of the actual heat exchangers in the automotive application.
(Less)
- author
- Fu, Jiahong
LU
; Miao, Xu
; Zuo, Qiang
; Tang, Huiping
; Li, Yong
LU
; Zhang, Yu
LU
and Sunden, Bengt
LU
- organization
- publishing date
- 2022-07
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Enhanced heat transfer, Field synergy, Forced vibration, Mechanical vibration, Thermal hydraulic performance
- in
- International Communications in Heat and Mass Transfer
- volume
- 136
- article number
- 106176
- publisher
- Elsevier
- external identifiers
-
- scopus:85132242333
- ISSN
- 0735-1933
- DOI
- 10.1016/j.icheatmasstransfer.2022.106176
- language
- English
- LU publication?
- yes
- id
- 9c0ffdc3-67c2-4b4a-b06e-dae64605c5a2
- date added to LUP
- 2022-09-22 15:37:12
- date last changed
- 2023-11-21 11:37:17
@article{9c0ffdc3-67c2-4b4a-b06e-dae64605c5a2,
abstract = {{<p>The internal heat exchangers of a vehicle in driving are excited by forced vibration due to road bumps. But the effect of this phenomenon on the thermal-hydraulic performance of the heat exchanger has not been systematically studied. To investigate the influence of this vibration on the heat transfer characteristics, a numerical model of the rectangular heat exchanger unit channel under vibration excitation was established and verified by experiments. It is found that compared to frequency, amplitude of vibration has a greater effect in enhancing heat transfer but when it is more than 4 mm, which leads to a rapid increase in the friction factor f. An index (j/j<sub>s</sub>)/(f/f<sub>s</sub>) and a thermal-vibration performance factor (TVPF) considering the frequency and amplitude are proposed to evaluate the effect of vibration on the heat transfer, and it is indicated that for real vehicle operation, an amplitude of 2 mm and frequency of 25 Hz can effectively enhance heat transfer. Besides, it was found that the velocity gradient field perpendicular to the main flow direction caused by vibration synergizes with the temperature gradient field. This work is meaningful and of significance to the practical design of the actual heat exchangers in the automotive application.</p>}},
author = {{Fu, Jiahong and Miao, Xu and Zuo, Qiang and Tang, Huiping and Li, Yong and Zhang, Yu and Sunden, Bengt}},
issn = {{0735-1933}},
keywords = {{Enhanced heat transfer; Field synergy; Forced vibration; Mechanical vibration; Thermal hydraulic performance}},
language = {{eng}},
publisher = {{Elsevier}},
series = {{International Communications in Heat and Mass Transfer}},
title = {{Heat transfer and field synergy characteristics in a rectangular unit channel under mechanical vibration}},
url = {{http://dx.doi.org/10.1016/j.icheatmasstransfer.2022.106176}},
doi = {{10.1016/j.icheatmasstransfer.2022.106176}},
volume = {{136}},
year = {{2022}},
}