TY - JOUR
T1 - Effects of contact angle on condensate topology, drainage and efficiency of a condenser with minichannels
AU - Walpot, R.J.E.
AU - Ganzevles, F.L.A.
AU - Geld, van der, C.W.M.
PY - 2007
Y1 - 2007
N2 - Epoxy coatings with good adhesion characteristics have been developed that are suitable for large-scale manufacturing and application in compact heat exchangers. Two of them, with a static contact angle for water of 105° and 79° have been tested in a finned-tube condenser comparing flat plate minichannels on the gas-side. Contrary to the expectation, the thermal efficiency of the 105° condenser is slightly less than that of the 79° one. This is due to a reduction of condensate drop size at detachment, resulting in relatively small dry paths after drainage. The finned-tube geometry is shown to be less favourable for a condenser than a compact cross-flow plate geometry with minichannels on both the gas- and coolant side.
AB - Epoxy coatings with good adhesion characteristics have been developed that are suitable for large-scale manufacturing and application in compact heat exchangers. Two of them, with a static contact angle for water of 105° and 79° have been tested in a finned-tube condenser comparing flat plate minichannels on the gas-side. Contrary to the expectation, the thermal efficiency of the 105° condenser is slightly less than that of the 79° one. This is due to a reduction of condensate drop size at detachment, resulting in relatively small dry paths after drainage. The finned-tube geometry is shown to be less favourable for a condenser than a compact cross-flow plate geometry with minichannels on both the gas- and coolant side.
U2 - 10.1016/j.expthermflusci.2006.10.008
DO - 10.1016/j.expthermflusci.2006.10.008
M3 - Article
SN - 0894-1777
VL - 31
SP - 1033
EP - 1042
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
IS - 8
ER -