Local Heat Transfer Coefficients for Forced-Convection Condensation of Steam in a Vertical Tube in the Presence of a Noncondensable Gas

Convective condensation of vapor in the presence of a non-condensable gas of high concentration in laminar flow in a vertical pipe

“…Traces of non-condensable gases may enter into the condenser either as gases dissolved in the boiler feed water or due to leakage in the condenser. The effect of the presence of these gases on the process of condensation of vapor inside vertical tubes and channels was studied in literature [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. It is found that the existence of low percentage of non-condensable gas in vapors greatly reduces the heat transfer and the condensation rates.…”

The use of waste heat from flue gas in the system of regeneration of steam boiler supply water

“…The process of heat exchange between hot flue gas and the water inside the pipes of the heat exchanger is limited by the value of the coefficient of heat penetration for the fuel, which, for forced convection, reaches the values of up to 500 W/m 2 K [9-11], whereas steam condensation for forced convection allows for achievement of this coefficient at the level ranging from 3•10 3 to 2•10 5 W/m 2 K [9][10][11][12][13][14]. In order to conduct heat recovery from flue gas effectively with the smallest possible size of heat exchanger, it is necessary to utilize the process of steam condensation in the flue gas [15][16][17][18][19][20].…”

Review of vapor condensation heat and mass transfer in the presence of non-condensable gas

“…Subsequently, Vierow and Schrock [87], Ogg [88], Siddique et al [89], Araki et al [90], Park and No [16], and Kim [91] completed the experimental study of FWC heat transfer with NCG in different sizes of vertical tubes. Kang and Kim [15] and Park and No [92] studied FWC experimentally in horizontal and vertical tubes and found that wavy condensation film effectively increased the heat transfer and decreased the influence of NCG.…”