Heat transfer intensification by enlarged surface roughness in the plate heat exchanger

Jan Wajs; Dariusz Mikielewicz

Heat transfer intensification by enlarged surface roughness in the plate heat exchanger

Abstrakt

In the paper an experimental analysis of passive heat transfer intensification technique employed in the case of the plate heat exchanger is presented. The passive intensification was obtained by a modification of the heat transfer surface. The roughness of surface was increased by a use of glass micro-beads. Single-phase convective heat transfer in the water-water system was studied. The experiment was accomplished in two stages. In the first stage the commercial plate heat exchanger was investigated, while in the second one – the identical heat exchanger but with the modified heat transfer surface. The direct comparison of thermal and flow characteristics between both devices was possible due to the assurance of equivalent conditions during the experiment. Equivalent conditions mean the same volumetric flow rates and the same media’s temperatures at the inlet of heat exchangers in the corresponding measurements’ series. The thermal and hydraulic characteristics are presented. The thermal analysis shows that in some range of heat flux density the overall heat transfer coefficient was higher for the commercial heat exchanger, while for the other was higher for the heat exchanger with modified surface. The influence of larger roughness on heat transfer cannot unequivocally be evaluated. Therefore as the next step the systematic investigations of model heat exchangers (only with one hot and one cold passage) will be conducted.

Autorzy (2)

Jan Wajs dr hab. inż.
Dariusz Mikielewicz prof. dr hab. inż.

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Informacje szczegółowe

Kategoria:: Aktywność konferencyjna
Typ:: publikacja w wydawnictwie zbiorowym recenzowanym (także w materiałach konferencyjnych)
Tytuł wydania:: 8th International Conference on Multiphase Flow (ICMF2013) strony 1 - 7
Język:: angielski
Rok wydania:: 2013
Opis bibliograficzny:: Wajs J., Mikielewicz D.: Heat transfer intensification by enlarged surface roughness in the plate heat exchanger// 8th International Conference on Multiphase Flow (ICMF2013)/ ed. Moo Hwan Kim Pohang, Korea: Pohang University of Science and Technology, Division of Advanced Nuclear Engineering, 2013, s.1-7
Weryfikacja:: Politechnika Gdańska