m5.2 - n(3M o ρ s 2 1/3 K ls C SAT t*Boon-Long correlation...

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Introduction - * Mass transfer very much affected * Two type of agitator was used * Usually we used vessels because : 1 - suspending solid particles . 2 - Ensuring that all the surface area avilable is utilized . 3 - Has a good transfer rate . * Physical Assumption : 1-we assumed that the solids are perfectly spheres and their spherical shape was retained during the process of dissolution in the experiment. 2- we assumed that these spheres were dissolving at the same rate throughout the experiment. *Note:No reaction in this experiment. -Objective 1-To study the dissolution of solid in an agitated liquid using different type of agitators. 2-To determine Kls. -Theoretical Background M/ Mo = (1- (4 π n/3M o ρ s 2 ) 1/3 K ls C sat t) 3 (M/ Moo) 1/3 = (1- (4 π n/3M o ρ s 2 ) 1/3 K ls C sat t ρ s = 3Mo/4 π r 3 n slope = - (4 π
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Unformatted text preview: n/(3M o ρ s 2 )) 1/3* K ls C SAT t *Boon-Long correlation : Sh = 0.046Re .283 Ga. 173 U-.011 (T/D) .019 SC .461 ω = 2лN Re=dTw π / ν ν = μ/ρ Ga = ρ 2 gd 3 ∕ μ 2 U = Mo/(d 3 ρ ( Sc = μ∕ ( ρ D v ( Kls= Sh*Dv/d C SAT = 1613 kg/m 3 T = 28.75 cm D v = 5.6e-10 m 2 /s Procedure 1-three sour ball solids were taken and weighed and their average diameter was calculated. 2- these balls were transferred in the agitated vessel. 3-the speed of the impeller was adjusted to 288 rpm. 4-three minutes later after dissolution, the balls removed, dried and they were weighed. Then they were placed back in the vessel. 5-The above step was repeated for 3 to 4 times and then the balls were taken out....
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m5.2 - n(3M o ρ s 2 1/3 K ls C SAT t*Boon-Long correlation...

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