文档介绍：International Journal of Multiphase Flow 36 (2010) 210–220
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International Journal of Multiphase Flow
journal homepage: ate/ijmulflow
Frost formation in vertical channels under natural convection
Marco Fossa a, Giovanni Tanda b,*
a Dipartimento di Ingegneria della Produzione, Termoenergetica e Modelli Matematici (DIPTEM), Università degli Studi di Genova, via all’Opera Pia 15a, I-16145 Genova, Italy
b Dipartimento di hine, Sistemi Energetici e Trasporti (DIMSET), Università degli Studi di Genova, via Montallegro 1, I-16145 Genova, Italy
article info abstract
Article history: Processes involving heat transfer from a humid air stream to a cold plate, with simultaneous deposition of
Received 12 February 2009 frost, are of great importance in a variety of refrigeration equipment. In this paper, frost growth on a cold,
Received in revised form 30 September 2009 vertical plate in free convection has been experimentally investigated. The cold plate ( m high,
Accepted 1 November 2009
m wide) was placed in vertical channels open at the top and bottom in order to permit the natural
Available online 10 November 2009
circulation of ambient air. The channels, rectangular in shape, were m high and m wide, with
This paper is dedicated to the memory of Dr. the depth set equal either to 20 mm, or 10 mm, or 6 mm in order to infer the influence of channel flow
Ing. Diego Garreffa, who made a significant area on the natural convection and frost formation. The cold plate temperature and the air relative
contribution to this research before he humidity were varied in the À40 to À4 °C and 31–85% range, respectively, with the air temperature held
passed away on January 6, 2007. fixed at 27 °C (±1 °C). Several quantities (thickness, temperature and mass of frost, heat flux at the cold
plate), were measured during the time-evolution of the process ( h from the frost growth inception),
Keywords: and are pres