A process for heating a pumpable food product comprising the steps of: a) providing a pumpable food product, b) transporting the pumpable food product through a continuous flow passage, c) heating the pumpable food product during at least part of the transporting of step b), characterised in that the flow rate of transportation during step b) comprises phases of acceleration and phases of deceleration, wherein the phases of acceleration and of deceleration periodically repeat.
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