W h a t a r e th e k e y d iffe r e n c e s aspect

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Unformatted text preview: e th e k e y d iffe r e n c e s ? Aspect ratio (length to thickness) Surface roughness W h a t g o v e r n s th e s e p r o p e r tie s ? What factors are of importance and interest? Effusion Rate (m3/s) F lo w V e lo c ity ( m /s ) F lo w L e n g th ( m ) F lo w D ir e c tio n - g o v e r n e d b y to p o g r a p h y L a m in a r v s T u r b u le n t? C o m p o u n d v s S in g le F lo w s C o o lin g Submarine or subareal? Thick crust or not? 2 Laminar vs Turbulent Two kinds of flow Laminar Turbulent For a Newtonian fluid, whether flow is turbulent or laminar depends on the Reynolds No., Re: Re = URρ/η Where U is velocity, R hydraulic radius, ρ density and η is viscosity Flow is turbulent when Re> 500 to 2000 For a Bingham Fluid, the critical ratio is the Hampton No: H = ρ U2/τc Critical value is 1000 Bottom Line: Turbulent vs. Laminar is probably not a factor E...
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This document was uploaded on 03/04/2014 for the course EAS 458 at Cornell University (Engineering School).

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