Chemical Engineering - Heat Transfer - Discussion
Discussion Forum : Heat Transfer - Section 2 (Q.No. 9)
9.
Dietus-Boelter equation used for the determination of heat transfer co-efficient is valid
Discussion:
2 comments Page 1 of 1.
K.Rama Krishna said:
7 years ago
Dittus-Boelter equation is valid for:
Re>10000.
0.6<=Pr<=1000.
L/D>10.
So, this equation is valid for fluids in turbulent flow.
Re>10000.
0.6<=Pr<=1000.
L/D>10.
So, this equation is valid for fluids in turbulent flow.
(1)
Ghazanfer ali said:
1 decade ago
The Dittus-Boelter equation (for turbulent flow) is an explicit function for calculating the Nusselt number. It is easy to solve but is less accurate when there is a large temperature difference across the fluid. It is tailored to smooth tubes, so use for rough tubes (most commercial applications) is cautioned. The Dittus-Boelter equation is:
Nu = 0.023 (Re)^0.8 (Pr)^n.
n = 0.4 for heating.
n = 0.3 for cooling of fluid.
Nu = 0.023 (Re)^0.8 (Pr)^n.
n = 0.4 for heating.
n = 0.3 for cooling of fluid.
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