Transient solidification of a liquid in axial flow into and through a cold rod bundle was investigated. Experiments are described in which the amount of liquid displaced through the rod bundle before freezing shut as a function of pressure drop was measured. Simple relations for the liquid mass displaced into or through the rod bundle were derived by combining the notion of a time-dependent hydraulic diameter with an available approximate method for treating transient solidification in a tube flow. The relations are shown to be approximately consistent with the experimental data.

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