Publication

Development of a Diabatic Two-Phase Flow Pattern Map for Horizontal Flow Boiling

John Richard Thome, Daniel Favrat
2002
Journal Articles

Abstract

An improved two-phase flow pattern map is proposed for evaporation in horizontal tubes. Based on new flow pattern data for three different refrigerants covering a wide range of mass velocities, vapor qualities and heat fluxes. The new flow pattern map includes the prediction of the onset of dryout at the top of the tube during evaporation inside horizontal tubes as a function of heat flux and flow parameters and is an extension to the flow pattern map model of Kattan et al.(5). The modifications proposed allow an accurate prediction of the flow pattern for very different fluids which are the substitute refrigerants (HFC- 134a and HFC-407C) and the natural refrigerant R-717(ammonia).

Official source

https://infoscience.epfl.ch/entities/publication/5c1309ff-eaf3-4dd3-8747-cc74e447890b

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John Richard Thome, Daniel Favrat
2002
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/5c1309ff-eaf3-4dd3-8747-cc74e447890b

About this result

Related concepts (32)

Refrigerant

A refrigerant is a working fluid used in the refrigeration cycle of air conditioning systems and heat pumps where in most cases they undergo a repeated phase transition from a liquid to a gas and back again. Refrigerants are heavily regulated due to their toxicity, flammability and the contribution of CFC and HCFC refrigerants to ozone depletion and that of HFC refrigerants to climate change. Refrigerants are used in a direct expansion (DX) system to transfer energy from one environment to another, typically from inside a building to outside (or vice versa) commonly known as an "air conditioner" or "heat pump".

Heat pump

A heat pump is a device that uses work to transfer heat from a cool space to a warm space by transferring thermal energy using a refrigeration cycle, cooling the cool space and warming the warm space. In cold weather a heat pump can move heat from the cool outdoors to warm a house; the pump may also be designed to move heat from the house to the warmer outdoors in warm weather. As they transfer heat rather than generating heat, they are more energy-efficient than other ways of heating a home.

Heat flux

In physics and engineering, heat flux or thermal flux, sometimes also referred to as heat flux density, heat-flow density or heat flow rate intensity, is a flow of energy per unit area per unit time. Its SI units are watts per square metre (W/m2). It has both a direction and a magnitude, and so it is a vector quantity. To define the heat flux at a certain point in space, one takes the limiting case where the size of the surface becomes infinitesimally small.

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Development of a Diabatic Two-Phase Flow Pattern Map for Horizontal Flow Boiling

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