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

180
Tke thermal e€l1'!ciluetlvity CDf.'
tile Carbop~aratu.s built by
tlae a.utk®l' and €l.esel"ibed in ref'erel'lee 83. Tlae aee'a!'ae.,-
of' the instrt'll'ael11t was esti..'l1l1ate€i to be ± .5.0~e The ex­
~erimem.ta.l va1u.es are presented i:m. Ta.b1e A-9. Wlthm the
accuracy of.' tBe data there is mo signif.'ie~t dlf.'f'erel1lee
betl.reen the values for the dif'f'eremt solutioRS. A regressiol1t.
analysis was performed, usin~ all the data points to obtain
a linear relationship between the tRer.mal conductivity of.'
the solutior.J.s and temperature. Tb.e rela tioP.l.ship "t-TaS f.'0und
to be
(A-14
2 ®
for k in Btu./Br .. ft. (F/f't .. ) an.d T in degrees Centigrade ..
Tb.e thermal cemductivity of' the solutloD.s was about the same
as water at 20°C ~d about 10 percent l0wer at 80@c ..
HEAT CAPAC ITY
1 1
The heat capacity of' water (given in Perry (143) at
several diff'erel1lt temperatures) varies yery little with
t~perature. A eOl1lst~t value of' 1.003 Btu/lb.@F C0vers
t~ range between 0° &Rd 100Ge vnth a Max~ of' 0.6 per-
TRe heat capacity CDf' glycerine so,lutioE.s crua be expressed
by (130)