A theoretical study on the control velocity of circular flanged hood

Chen, Yu-Kang; Yeh, Wen-Yu; Chen, Chun-Wan

doi:10.1016/s0021-8502(98)90297-x

Cited by 1 publication

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A streamline can be determined by a Runge-Kutta integration (14) about a Lagrangian equation. (11) Figure 8 shows comparisons between the present measurements and the finite-opening potential flow theory (6,11) at D ϭ 10 cm and various R. Apparently, the computational results deviate from the experimental data in a tolerable range. The maximum deviation is about 9% in x/D and 8% in y/D.…”

Section: Extension To Different Opening Sizesmentioning

confidence: 77%

“…Also, the viscosity and its associated effects, such as the boundary layer induced on the flange, nonsingularity at the edge of the opening, turbulent dispersion effect, and so forth, may cause deviation between measurements and computations. Figure 9 shows the comparisons between the computational results of the finite-opening potential flow theory (11) at D other than 10 cm and the experimental results at D ϭ 10 cm at various R. All experimental and computational results fall in a narrow band, which is far from the results of the point sink theory. The characteristic lengths in Figure 10 also show the correspondence of various sizes of the hood opening.…”

Section: Extension To Different Opening Sizesmentioning

confidence: 94%

“…Although the theoretical justification of the nondimensional equations explains the applicability in different hood diameters, no other experimental results agree with this explanation. To the extent that Equations 9-12 apply to different opening diameters, the computational results derived from the finite-opening potential flow theory (6,11) are employed for comparison. The finiteopening potential flow computational method deals with an inviscid, irrotational flow.…”

Section: Extension To Different Opening Sizesmentioning

confidence: 99%

“…The physical situation is similar to the case of the aspiration of air from a moving free stream into an aerosol sampler. (10) Chen et al (11) and Alenius (12) employed a modified potential flow theory to calculate the flow field of a finite-opening circular hood subject to the influence of a cross draft. They obtained a limiting trajectory describing the outer boundary of a capture envelope.…”

mentioning

confidence: 99%

See 3 more Smart Citations

The Capture Envelope of a Flanged Circular Hood in Cross Drafts

Huang¹,

Chen

et al. 2001

AIHAJ - American Industrial Hygiene Association

Self Cite

View full text Add to dashboard Cite

The flow patterns of an exterior circular hood subject to the influence of various uniform cross drafts were experimentally studied in an apparatus consisting of hood-model/wind-tunnel assembly. A two-component laser Doppler anemometer was employed to measure the velocity field on the symmetry plane. The streamline patterns were obtained from the measured velocity data. The cross draft caused a characteristic envelope similar to a half Rankine body-of-revolution to form in the flow field. The boundary of the envelope is described by a dividing streamline. All streamlines within the envelope lead to the opening; those outside the envelope evolve to the downstream area. The normalized geometry of the capture envelope is theoretically justified and correlated by modifying the potential theory of point-sink-plus-rectilinear-flow. The domain and shape of the envelope enclosing the hood opening are determined primarily by the velocity ratio between the cross draft and hood suction. The correlated formula is applicable to design the hood parameters, including the sizes of opening and flange as well as the location of contaminant sources.

show abstract

Section: Extension To Different Opening Sizesmentioning

confidence: 77%

Section: Extension To Different Opening Sizesmentioning

confidence: 94%

Section: Extension To Different Opening Sizesmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations