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 ...

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179 speecil. did Rot eha:mge td tk i:m.ereasim., times @f skear.. Carb0:fJ®1 s01'U.tiollS therei"@!l'e we~ net t:i.l¥!.e-cii.epemGl.emt. The The retatimg shaft of the spindle aE.Cl. als@ ue impeller sha.f't were checked to see if' the f'luid (t.rept up the shaft.. Tlaere WillS aJ!l absence of' creep and tkerei'ore the f'luiCl.s were assum.ed to he ROB-viscoelastic. THERMAL CONDUCTIVITY .. nf1t .. 1 it I The thermal eonductivity, k, is used in beth. the Nusselt number a:m.d the Pr~dtl llumber. Bates (11) reports the thermal eOllcil.uctivity of' both water ~d glycer:i:m.e.. Tke thermllll eellduetivity of' water is ex~ressed as (A-12 :ror k iIt caL./em. 2 0C see./em. and T in degrees Centigrade. Tkis is multiplied by 242 to give the thermal conductivity im tae desi~ed umits .. k = 0.325+ o.ooo888T (A-13 TRe ~ermal eoncil.uetivity of glyeeriae does not vary with temperature above a eomeentratien of' 90 percent. Tke taer.mal eonauetivity is 0.00072 ~d 0.00070 at 90 &na 95 percent pure respectively. The thermal conductivity of' 93.7 percent glyeerille was inte~olated to he 0.00071 cal./ 8m. 2 8ee.oC/e111.. or 0.172 Btujhr. :rt. 2 ~/tt. The aceuraey

179<br />

speecil. did Rot eha:mge td tk i:m.ereasim., times @f skear..<br />

Carb0:fJ®1 s01'U.tiollS therei"@!l'e we~ net t:i.l¥!.e-cii.epemGl.emt.<br />

The<br />

The<br />

retatimg shaft <strong>of</strong> the spindle aE.Cl.<br />

als@ ue impeller sha.f't<br />

were checked to see if' the f'luid (t.rept up the shaft.. Tlaere<br />

WillS aJ!l absence <strong>of</strong>' creep and tkerei'ore the f'luiCl.s were assum.ed<br />

to he ROB-viscoelastic.<br />

THERMAL CONDUCTIVITY<br />

.. nf1t .. 1 it I<br />

The thermal eonductivity, k, is used in beth. the Nusselt<br />

number a:m.d the Pr~dtl llumber.<br />

Bates (11) reports the<br />

thermal eOllcil.uctivity <strong>of</strong>' both water ~d glycer:i:m.e..<br />

Tke<br />

thermllll eellduetivity <strong>of</strong>' water is ex~ressed<br />

as<br />

(A-12<br />

:ror k iIt caL./em. 2 0C see./em. and T in degrees Centigrade.<br />

Tkis is multiplied by 242 to give the thermal conductivity<br />

im tae desi~ed umits ..<br />

k = 0.325+ o.ooo888T<br />

(A-13<br />

TRe ~ermal<br />

eoncil.uetivity <strong>of</strong> glyeeriae does not vary<br />

with temperature above a eomeentratien <strong>of</strong>' 90 percent. Tke<br />

taer.mal eonauetivity is 0.00072 ~d 0.00070 at 90 &na 95<br />

percent pure respectively. The thermal conductivity <strong>of</strong>'<br />

93.7 percent glyeerille was inte~olated to he 0.00071 cal./<br />

8m. 2 8ee.oC/e111.. or 0.172 Btujhr. :rt. 2 ~/tt. The aceuraey

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