Studies on the boiling and condensation of nitrogen

De Sousa, Aldo Joao (1989) Studies on the boiling and condensation of nitrogen. University of Southampton, Doctoral Thesis.

Abstract

Both boiling and condensation of Nitrogen have been studied throughout this work. In Part I, `Methods to increase the performance of boiling heat transfer' studies have been made with pool boiling, narrow channel and flash boiling. Aluminium samples (5cm x 5cm) with different surface characteristics were utilised and both liquid Nitrogen and liquid Oxygen were used as working fluids. In Part II, `Angular dependency study of nucleate boiling and critical heat flux - CHF' the overall heat transfer coefficients of Aluminium and Copper samples with different surface finishes have been measured at atmospheric pressure. In Part III a 60cm long vacuum brazed Aluminium plate-fin rig was constructed with a central condensing channel and boiling channels of the same dimension on either side in order to study the combined heat transfer during boiling and condensation. Nitrogen vapour was condensed in a down flow along the condensing channel and was revaporised in the reboiler. The effect of a noncondensable gas on the heat transfer performance of the same condenser-reboiler heat exchanger utilised in Part III has been studied in Part IV. The objective of this work was to study the effect of a noncondensable gas (Helium) on heat transfer during the condensation of the Nitrogen vapour.

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