Prediction of batch heat transfer coefficients for pseudoplastic fluids ...
Prediction of batch heat transfer coefficients for pseudoplastic fluids ... Prediction of batch heat transfer coefficients for pseudoplastic fluids ...
605·36 Llbrary Newark Colle e of Enp:lneerfn ABSTRA.CT Experimental batch heat-trans~er data were obtained for both Newtonian ~nd pseudoplastic liquids in a baffled agi tated vessel. The fluids tested had flo1f behavior indexes between 0.36 and 1.0; and the apparent viscosity ranged from 1 to 1200 centipoise. Four types of impellers (anchor, paddle, propeller, and disk and vane turbine) were studied using eleven separate impellers. The probable error in the measured heat trall.sfer coefficient was ± 20 percent. The effects of the generalized Reynolds number, generalized Prandtl number, and viscosity ratio were studied. In addition the effect of impeller diameter was studied for paddles, propellers, and turbines; and the effect of impeller width was studied ~or the paddles and turbines. The vertical height of the impeller above the bottom of the vessel was shown to be a significant variable. The data for the Newtonian liquids, in general, substantiated presently accepted correlations. For the pOi..Jer laH pseudoplas tic fluids bJO correlations 1.Jere developed .. One correlation l'1faS based on the dimensional analysis of the equations describing a flOi..] model of the system. The second correlation is based on Metzner's evaluation of the rate of shear in an agitated vessel. The former correlation has five to seven constants which vary with impeller type
while the latter has five to seven constants, two of k'lhich vary "ri th the impeller type.. 1fmen the flow behavior index is 1.0 both correlations reduce to the generally accepted correlations for :HeHtonian liquids.. The correlations fit the experimental data 'I'li th an average error of ± 10 to 11]. percent .. 1/
- Page 1 and 2: Copyright Warning & Restrictions Th
- Page 3: PREDICTION OF BATCH HEAT TRANSFER C
- Page 7 and 8: ACKNOWLEDGEMENTS The auther ex~ress
- Page 9 and 10: Chapter 1: Chapter 2: Introducticm
- Page 11 and 12: LIST OF FIGURES page 2-1 FlGW Behav
- Page 13 and 14: CHAPTER I INTRODUCTION BATCH HEAT T
- Page 15 and 16: 3 as pseudoplasticso Pseudoplastic
- Page 17 and 18: 5 ~n addition to studying the effec
- Page 19 and 20: 7 A B SLOPE = /'n- .( 10 ~y FIG 2-1
- Page 21 and 22: 15.5, 183, 185).. Most of their eff
- Page 23 and 24: va:ry withl. the slaear I'Rte.. 11.
- Page 25 and 26: 13 RHEOLOGIC_~ INVESTIGATION OFPO~~
- Page 27 and 28: IS In(s) (2-8 (2-9 where Re is the
- Page 29 and 30: '7 ft~ easier method of calibrating
- Page 31 and 32: 19 of' thixotropic breakdown l'Ji t
- Page 33 and 34: 21 complicated by a variable viscos
- Page 35 and 36: 2J Schultz-GrQnow (174) used a dime
- Page 37 and 38: 2S The results shm-red that equatio
- Page 39 and 40: Su.bstituti011 of equati 2-22 gives
- Page 41 and 42: 29 In both Newtonian and non-Newton
- Page 43 and 44: 31 for viscous pseudoplas tics at 1
- Page 45 and 46: 33 (2-29 when both the distances ar
- Page 47 and 48: JS Thermometers or thermocouples ar
- Page 49 and 50: .37 2: a in in heat cQ@tent of the
- Page 51 and 52: J9 cooling mediu..:m side, the heat
- Page 53 and 54: 41 ports a value of 3/4-.. He then
while the latter has five to seven constants, two <strong>of</strong> k'lhich<br />
vary "ri th the impeller type..<br />
1fmen the flow behavior index<br />
is 1.0 both correlations reduce to the generally accepted<br />
correlations <strong>for</strong> :HeHtonian liquids.. The correlations fit<br />
the experimental data 'I'li th an average error <strong>of</strong> ± 10 to 11].<br />
percent ..<br />
1/
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