Generalized equation for the design of a baffle to generate arbitrary flow velocity profiles. Issue 149 (February 2016)

• Record Type: Journal Article
• Authors: Choi, M.K.; Cho, M.K.; Lee, H.W.; Jung, H.; Lee, J.W.
• Is Part Of: Journal of wind engineering and industrial aerodynamics. Issue 149(2015)
• Page Start: 30
• Page End: 34
• Publication Date: 2016-02
• Subjects: B channel breadth [m] -- Cd discharge coefficient [dimensionless] -- D hole diameter [m] -- f(y) normalized velocity profile at the inlet (=V1/V0) -- g(y) normalized velocity profile at the outlet (=V2/V0) -- H channel height [m] -- N number of holes [EA] -- ΔP pressure drop through the distribution panel [Pa] -- P0 pressure at the inlet [Pa] -- P1 pressure just upstream of the distribution panel [Pa] -- P2 pressure after the distribution panel [Pa] -- Pb pressure at the outlet [Pa] -- t panel thickness [m] -- V1 (y) velocity profile across the flow cross-section at the inlet [m/s] -- V2 (y) velocity profile across the flow cross-section at the outlet [m/s] -- V0 average velocity [m/s] -- W length of the separating plate [m] -- x coordinate along the flow direction -- y coordinate normal to the flow direction -- α parameter representing the change of velocity profile per hole -- β local porosity (=D/(D+W(y))) [dimensionless] -- β0 average porosity [dimensionless] -- ε maximum % error between the predicted and the real results -- ρ density [kg/m3]; Baffle -- Flow velocity profile -- Transformation -- Local porosity distribution; Wind-pressure -- Periodicals; Buildings -- Aerodynamics -- Periodicals; Pression du vent -- Périodiques; Constructions -- Aérodynamique -- Périodiques; Buildings -- Aerodynamics; Wind-pressure; Periodicals
• DOI: 10.1016/j.jweia.2015.11.013
• Languages: English
• ISSNs: 0167-6105

Abstract

Abstract: Flow velocity profiles can be transformed using non-uniform resistance elements, and the design equation for the distribution of pores in a single baffle plate of uniform thickness was formulated to transform any flow velocity profile into another arbitrary velocity profile. The proposed equation was validated first through numerical analysis for a couple of velocity profiles with satisfactory results, and then verified by an experiment with an excellent agreement of maximum difference less than 4.3%. Also found was an empirical relation between the number of holes in the baffle and the accuracy of the transformed velocity profile.