A smoke visualisation technique for wake flow from a moving human manikind

Inthavong, K, Tao, Y, Petersen, P, Mohanarangam, K, Yang, W and Tu, J 2017, 'A smoke visualisation technique for wake flow from a moving human manikind', Journal of Visualization, vol. 20, no. 1, pp. 125-137.

Document type: Journal Article
Collection: Journal Articles

Title A smoke visualisation technique for wake flow from a moving human manikind
Author(s) Inthavong, K
Tao, Y
Petersen, P
Mohanarangam, K
Yang, W
Tu, J
Year 2017
Journal name Journal of Visualization
Volume number 20
Issue number 1
Start page 125
End page 137
Total pages 12
Publisher Springer
Abstract An experimental technique using the chemical reaction between acetic acid (CH3COOH) and cyclohexylamine (C6H13N) generated smoke to visualise wake flow from a moving object. A 1/5th scaled manikin was dabbed with cyclohexylamine on specific locations and entered an acetic acid saturated chamber. Smoke was generated via the chemical reaction as the manikin moved through the chamber. High-speed photography and image processing techniques were used to determine whether qualitative and quantitative data could be produced for (1) better understanding the effects of trailing wakes on particle exposure induced by human movement and (2) validation data for computational fluid dynamic (CFD) modelling results. Image analysis showed three phases of manikin movement: peak velocity, deceleration, and stationary. Detailed flow separation images showed that regular vortices were produced at the left shoulder, while flow separating at the hand swirled behind and inwards. Analysis of flow over the head revealed how the separation point shifted from the back of the head to the front as the velocity decreased. The results demonstrated that the experimental method was feasible in producing meaningful results for wake flow phenomena behind a manikin and validation data for CFD simulations. Graphical abstract: [Figure not available: see fulltext.]
Subject Flow Analysis
Environmental and Occupational Health and Safety
Keyword(s) Moving manikin
Occupational exposure
Smoke visualisation
Wake flow
DOI - identifier 10.1007/s12650-016-0386-2
Copyright notice © 2016 The Visualization Society of Japan
ISSN 1343-8875
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