scholarly journals Basic Study on Perfect Push-Pull Local Ventilation (3rd Report, Influence of the Distance between Nozzle and Hood on Flow Characteristics of Push-Pull Flow)

2011 ◽  
Vol 77 (776) ◽  
pp. 1054-1063
Author(s):  
Yukihiro HATTORI ◽  
Koichi NAKABAYASHI ◽  
Osami KITOH ◽  
Motoyuki ITO
Keyword(s):  
Flow Characteristics ◽  
Basic Study ◽  
Local Ventilation

Theoretical and Experimental Estimation of Inter-Segmental Clothing Ventilation and Impact on Human Segmental Heat Losses

2015 ◽  
Author(s):  
Nagham Bilal Ismail ◽  
Nesreen Ghaddar ◽  
Kamel Ghali
Keyword(s):  
Human Body ◽  
Flow Characteristics ◽  
Heat Losses ◽  
The Body ◽  
Thermal Manikin ◽  
Body Parts ◽  
Tracer Gas ◽  
Wind Speeds ◽  
Local Ventilation ◽  
Ventilation Rates

Air exchange between a specific garment and the environment could occur 1) through the fabric with the environment, 2) through garment apertures with the environment, and 3) between local body parts’ microclimates. The first mechanism is related to the fabric properties and the flow characteristics around the human body. The second mechanism is induced by buoyancy and pressure alteration due to external wind. The third mechanism named inter-segmental ventilation occurs between different clothing sections caused by position of apertures, relative wind, fabric permeability and microclimate size of connected clothed segments. The objective of this work is to develop a simplified accurate model that solves coupled momentum, mass and heat balances including buoyancy for the connected clothed upper human body to predict inter-segmental ventilation and assess its impact on the air flow characteristics in the microclimate layer and on local ventilation rates. This model is coupled to the bioheat model to predict the effect of the inter-segmental ventilation on the heat losses from the body and on bringing the thermal comfort. The model is validated by performing an improved experimental method on a thermal manikin using the tracer gas method at different wind speeds for permeable clothing.

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