Numerical study of the convective heat transfer coefficient of the hand and the effect of wind

File
2020_GS_ALert_Pub_SongG__Numerical_study_of_the_convective.pdf (1.67 MB)

File Embargoed Until: (2022-11-25)
Date
2020-11-25
Authors
Song, Guowen
Li, Rui
Zhang, Mengying
Li, Rui
Wu, Yulin
Wang, Liwen
Song, Guowen
Li, Jun
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Altmetrics
Authors
Li, Rui
Person
Research Assistant Professor
Research Projects
Organizational Units
Journal Issue
Series
Department
Apparel, Events and Hospitality Management
Abstract

This study aimed to investigate the effect of wind speed and direction on the convective heat transfer coefficient of the human hand, considering the specific geometry of human hands. Computational fluid dynamics (CFD) simulation of the heat transfer and airflow between the hand and surrounding environment was performed. The numerical hand form was created from a surface scan of a thermal hand manikin and divided into 18 sections, including the palm, dorsal, wrist, and five fingers, with each section divided into three parts: fingertip, middle digit, and finger root. The numerical simulation results were compared with the experiment data and showed good conformity. The numerical results showed that the local convective heat transfer coefficient of each of the 18 hand sections varied significantly due to the specific local geometry of the hand. The convective heat transfer coefficients of the five fingers are larger than those of the palm, dorsal, and wrist, and the fingertip is the most vulnerable section to heat loss. The convective heat transfer coefficient of the whole hand increased from 4.30 to 26.49 W/(m2·K) when wind speeds increased from 0.05 to 2.0 m/s. Wind directions had little effect on the convective heat transfer coefficient of the whole hand but had a significant impact on different individual hand sections. The CFD model, along with the developed regression equations of convective heat transfer coefficient with wind speed, can be a foundation for further study on the interaction of human hands with various thermal environments to improve thermal comfort and work efficiency.

Comments

This accepted article is published as Zhang, M., Li, R., Wu, Y., Wang, L., Song, G., Li, J., Numerical study of the convective heat transfer coefficient of the hand and the effect of wind. Building and Environment, 25 November 2020, 107482. doi: 10.1016/j.buildenv.2020.107482

Description
Keywords
Citation
DOI
Collections