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Prediction of batch heat transfer coefficients for pseudoplastic fluids ...

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108<br />

the <strong>batch</strong> than the other ticJO thermocouples.<br />

At high iropeller<br />

speeds, the wall temperature became relatively constant<br />

over the whole surface.<br />

It was felt that these data sh~wed<br />

that the local <strong>heat</strong><br />

trruLsfer <strong>coefficients</strong> vary from point to point in the vessel.<br />

In those portions <strong>of</strong> the vessel v!hich V·Jere best agitated<br />

the <strong>heat</strong> was conducted from the wall at a faster rate than<br />

in the poorly agitated regions.<br />

Considering a unit area <strong>of</strong> the wall <strong>for</strong> any portion <strong>of</strong><br />

the vessel the ratio <strong>of</strong> the driving <strong>for</strong>ce to the resistance<br />

is a constant <strong>for</strong> each <strong>of</strong> the resistances in series. Thus,.<br />

negle cting the <strong>heat</strong> capacity <strong>of</strong> the l

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