MARCHITTO , Annalisa

A new approach to the classical slug flow model is here proposed based on an original correlation for the minimum liquid level in the stratified regions of intermittent horizontal flows. This correlation is obtained by fitting experimental data obtained from a statistical analysis of void fraction signals from ring impedance probes. The new...

The experimental investigation presented in this paper is aimed at understanding the main mechanisms which drive the flow distribution inside a two-phase horizontal header in order to design improved distributors and to optimise the flow distribution inside compact heat exchanger. Experimentation was devoted to establish the influence of the...

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Uniform fluid and phase distribution is essential for efficient operation of engineering equipment such as plate heat exchangers, reactors, mixers where two phases are flowing together. Even though the principles of single phase distribution in parallel channels have been studied for more than three decades, further work is needed when a...

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Descrizione di una tecnica sperimentale per la misura simultanea dell'emittenza termica del calore specifico per materiali solidi

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Uniform fluid distribution is essential for efficient operation of chemical-processing equipment such as contactors, reactors, mixers, burners and in most refrigeration equipment, where two phases are acting together. To obtain optimum distribution, proper consideration must be given to flow behaviour in the distributor, flow conditions...

Uneven phase distribution in heat exchangers is a cause of severe reductions in thermal performances of refrigeration equipment. To date, no general design rules are available to avoid phase separation in manifolds with several outlet channels, and even predicting the phase and mass distribution in parallel channels is a demanding task. In the...

The air and water flow distribution are experimentally studied in a test section simulating a heat exchanger composed by a round header and 16 parallel upward channels. The effects of the tube protrusion depth as well as the gas and liquid superficial velocities are investigated and the results are compared with previous data. A new fitting...

Viene presentato il risultato dello studio condotto presso l'Università degli Studi di Genova per conto del Comune di Cogorno (Ge) in tema di riqualificazione energetica, ambientale ed economica delle strutture esistenti sul territorio dei comuni italiani di medie e piccole dimensioni. Si propone un simulatore in grado di offrire un supporto...

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Two-phase horizontal intermittent flow through orifice contractions is experimentally investigated by means of a new impedance meter able to collect void fraction data simultaneously at different pipe locations. The investigation focuses on twophase structure in the region downstream of orifice. Experiments were carried out on horizontal...

Two-phase horizontal intermittent flow in straight pipes is experimentally investigated. A new procedure is proposed to characterize the flow through the statistical analysis of the instantaneous cross-sectional averaged void fraction obtained by means of ring impedance probes. The algorithm, based on the statistical analysis of the void...