Chemical Engineering Basics
Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type

Parallel flow with unequal heat capacities
Parallel flow with equal heat capacities
Counter flow with unequal heat capacities
Counter flow with equal heat capacities

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Chemical Engineering Basics
Maraging steels derive their strength from the following mechanism:

A fine, highly dislocated and strong martensite
Fine dispersions of Fe₃ C nucleated on dislocations in austenite
Fine dispersions of intermetallics of Fe, Ni, Ti etc
Fine dispersions of alloy carbides in a ferrite matrix

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