Fundamental study of hydrodynamics and mass transfer in annular-mist flow

Flow boiling is an efficient heat transfer mechanism and it is the main choice when dealing with high heat fluxes encountered in the miniaturized process equipment such as micro- and mini-heat exchangers. In this sense, annular-mist flow regime is particularly relevant since it is one of the most common two-phase flow regimes found in several industrial applications. The project address two main issues within the area of annular- mist flow, namely the mathematical modeling and the experimental investigation of annular-mist flow in order to get a better insight into the underlying physical phenomena controlling heat and mass transfer during this flow regime.

           
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Experimental Facility

The Two Phase Flow Instability facility is installed within the Varmeteknisk Lab, EPT, NTNU. Details about the facility can be found in the Thermal Two Phase Flow Laboratory. Main Characteristics of the facility:

 

Fluid

R134a
 

System Pressure

4-15bar
 

Mass flow rate

5-1000kg/m2s
 

vSubcooling

v0 - 50K
 

Max. Power

2KW

 

Visualisation of flow boiling. Fluid R134a.
5mm ID .

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PhD Thesis

Espen Rogstad, (2016 - 2019). Study of annular-mist flow.
Supervisor: Carlos A. Dorao, Co-Supervisor: Maria Fernandino.

Manuel Auliano, (2014-2). Fund. study of hydrodynamics in annular-mist flow.
Supervisor: Carlos A. Dorao, Co-Supervisor: Maria Fernandino.

Julio Pacio, (2012). Multiscale thermo-hydraulic modeling of cryogenic heat exchangers. Supervisor: Carlos A. Dorao, Co-Supervisor: Maria Fernandino, Jostein Petersen

MSc. Thesis

 

Undergraduate Thesis

Mikkel Sørrum, (2013). Experimental investigation of the effect of heat flux and mass flow rate in oscillations characteristics of Density Wave Oscillations. Project Thesis. NTNU.

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