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Zigzag tube in heat treatment is used for which purpose?

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Zigzag tube in heat treatment is used for which purpose?

(a) Fouling

(b) Standardization

(c) Holding for a long holding time

(d) Discard

This question was addressed to me by my school principal while I was bunking the class.

The query is from Heat Exchangers topic in section Building Blocks of Dairy Processing of Dairy Engineering

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Correct answer is (c) Holding for a long holding time

The explanation: Correct heat treatment requires that the milk is held for a specified time at pasteurization temperature. This is done in an external holding cell. A holding cell usually consists of a pipe arranged in a spiral or zigzag pattern and often covered by a metal shroud to prevent people from being burned if they touch the holding cell.

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