Design method and modeling verification for the uniform air flow distribution in the duct ventilation

Based on European Standard EN441-2, an experiment system for measuring the thermal properties of refrigerated display cabinet is designed and constructed. Considering the practice requirements from user, the air distribution analysis is doing under various air-flow form in the testing room. This paper uses the FLUENT, which is one of the CFD simulation software, to verify the design method of air movement. Finally a series of tests required for laboratory quality regulation have been done and the data of velocity or temperature is under the new requirement.

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Prediction Method on Effect of Thermal Performance of Heat Exchanger due to Non-uniform Air Flow Distribution

10.4271/850041 ◽

1985 ◽

Cited By ~ 6

Author(s):

F. Kondo ◽

Y. Aoki

Keyword(s):

Heat Exchanger ◽

Thermal Performance ◽

Air Flow ◽

Prediction Method ◽

Flow Distribution

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Experimental investigation of the air flow in a simplified underhood environment

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1177/09544070211059786 ◽

2021 ◽

pp. 095440702110597

Author(s):

Randi Franzke ◽

Simone Sebben ◽

Emil Willeson

Keyword(s):

Flow Field ◽

Laser Doppler Anemometry ◽

Fluid Dynamic ◽

Air Flow ◽

Measurement Data ◽

Quality Measurement ◽

Flow Distribution ◽

Lateral Position ◽

Reference Case ◽

Lateral Direction

In this paper, a simplified underhood environment is proposed to investigate the air flow distribution in a vehicle-like set-up and provide high quality measurement data that can be used for the validation of Computational Fluid Dynamic methods. The rig can be equipped with two types of front openings representative for electrified vehicles. Furthermore, it is possible to install differently shaped blockages downstream of the fan to imitate large underhood components. The distance between the blockages and the fan can be varied in longitudinal and lateral direction. The measurements are performed with Laser Doppler Anemometry at a fixed distance downstream of the fan. The results show that the lack of an upper grille opening in the configuration for a battery electric vehicle has a notable impact on the flow field in the reference case without any downstream blockage. However, the differences in the flow field between the two front designs become less when a downstream obstruction is present. The longitudinal and lateral position of the blockages have a minor impact on the flow field compared to the shape of the obstacle itself.

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Measurement of Air Flow Outside a Burning Cigarette during a Puff using Particle Image Velocimetry

Beiträge zur Tabakforschung International/Contributions to Tobacco Research ◽

10.2478/cttr-2013-0783 ◽

2004 ◽

Vol 21 (4) ◽

pp. 216-222

Author(s):

A Nagao ◽

K Miura ◽

S Kitao ◽

M Horio

Keyword(s):

Particle Image Velocimetry ◽

Particle Image ◽

Air Flow ◽

Maximum Velocity ◽

Flow Distribution ◽

Combustion Mechanism ◽

Air Flow Rate ◽

Tracer Particles ◽

Image Velocimetry ◽

Cigarette Paper

AbstractIn order to clarify the mechanism for the generation of cigarette smoke, the combustion mechanism of a burning cigarette during a puff was investigated by focusing on air transfer. In particular, the air flow distribution outside a burning cigarette was observed and related to the aerodynamic effects of the cigarette paper and the puffing rate. The air flow rate was measured by Particle Image Velocimetry (PIV), using olive oil droplets as the tracer particles. It was found that air does not flow into the tip of the burning cigarette and that the air flow was concentrated at the region -2 to 2 mm around the cigarette paper char-line. This behavior was independent of the cigarette paper basis weight. When the puffing rate was changed from 2.5 to 35 mL/s, the air flow was concentrated at a region close to the cigarette paper char-line and the maximum velocity around the cigarette paper char-line increased with the puffing rate.

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Optimal design for the dual slot die in melt blowing process

Thermal Science ◽

10.2298/tsci1405714w ◽

2014 ◽

Vol 18 (5) ◽

pp. 1714-1715

Author(s):

Li-Li Wu ◽

Ting-Ting Cheng ◽

Chuan Xu ◽

Ting Chen

Keyword(s):

Experimental Design ◽

Optimal Design ◽

Flow Field ◽

Design Method ◽

Air Flow ◽

Variance Analysis ◽

Orthogonal Experimental Design ◽

Melt Blowing ◽

Experimental Design Method ◽

Slot Die

The parameters of the dual slot die in an industrial melt blowing equipment are designed optimally using the orthogonal experimental design method. The air flow fields of different die parameters are simulated. Effects of the die parameters are analyzed using variance analysis. The results show that the inset distance and slot width have significant effects on the air flow field while effect of the slot angle is unremarkable.

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