In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D1 and D2 are I.D. of inner and outer pipes)
A. $$\frac{{{\text{D}}_2^2 - {\text{D}}_1^2}}{{{\text{D}}_1^2}}$$
B. D2 - D1
C. $$\frac{{{\text{D}}_2^2 - {\text{D}}_1^2}}{{{\text{D}}_2^2}}$$
D. None of these
Answer: Option A
This Question Belongs to Chemical Engineering >> Process Equipment And Plant Design
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