Details

Autor(en) / Beteiligte

• SUDO, Yukio
• USUI, Tohru
• KAMINAGA, Masanori

Titel

Heat Transfer Characteristics in Narrow Vertical Rectangular Channels Heated from Both Sides

Ist Teil von

• Transactions of the Japan Society of Mechanical Engineers Series B, 1989/04/25, Vol.55(512), pp.1174-1180

Ort / Verlag

The Japan Society of Mechanical Engineers

Erscheinungsjahr

1989

Quelle

Elektronische Zeitschriftenbibliothek (Open access)

Beschreibungen/Notizen

• The effects of gap size on heat transfer characteristics were investigated experimentally for a vertical rectangular flow channel with a gap of 2.5 mm, 6 mm and 18 mm. As a result, the following was revealed. Flow shows the nature of forced convective heat transfer when Grx/Re21/8xPr1/2 is less than 2.5×10-4, and the nature of free convective heat transfer when Crx/Re21/8xPr1/2 is higher than 1.8×10-3, commonly for three gaps of flow channel. As for the data with a gap of 2.5 mm in the transition region between forced convection and free convection, it was confirmed that the higher heat transfer coefficient than that predicted by a heat transfer correlation for turbulent forced convection along a flat plate was owing to the acceleration of the main flow by the development of the boundary layer, not to buoyancy force.