Condensation inside horizontal tubes

The Boyko-Kruzhilin equation, equation 12.52, can be used to estimate the coefficient for annular flow. 

For condenser design, the mean coefficient should be evaluated using the correlations for both annular and stratified flow and the higher value selected. 

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Pressure drop during condensation inside horizontal tubes can be computed by using the correlations for two-phase flow given in Sec. 6 and neglec ting the pressure recoveiy due to deceleration of the flow. 

Figure 10-75. Condensing inside horizontal tubes. (Used by permission Akers, W. W., Deans, H. A., and Grosser, O. K. Chemical Engineering Progress, V. 55, No. 29, 1959. American Institute of Chemical Engineers. All rights reserved.)...

For condensation inside horizontal tubes, the Nusselt Equation can be applied with a correction for the reduction in condensing coefficient caused by the accumulation of condensation. The correction usually applied is 0.8. No correction for the number of tubes is required. Thus, for condensation inside horizontal tubes ... 

For condensation inside horizontal tubes, with low condensation rates or short tubes, at low vapour velocities (inlet Rev < 35000) the liquid condensate runs off in a stratified condition, and ... 

Condensation Inside Horizontal Tubes. This mode is employed chiefly in air coolers where it is the only feasible mode. As condensation proceeds, liquid tends to build up in the tubes, then slugging and oscillating flow can occur. 

Select the calculation method to be used. Condensation inside horizontal tubes can be predicted assuming two mechanisms. The first assumes stratified flow, with laminar film condensation. The... 

The following equations can be used to predict heat-transfer coefficients for condensation inside horizontal tubes For stratified flow,... 

Heat Transfer Correlations for Film Condensation 581 10-6 Film Condensation Inside Horizontal Tubes 591 10-7 Dropwise Condensation 591... 

The correlation of heat transfer of vapor condensing inside horizontal tubes is given by ... 

Inside Horizontal Tubes Condensation inside horizontal tubes can be predicted assuming two mechanisms laminar film condensation and vapor shear dominated condensation in which the two-phase flow is in the annular region. For laminar film condensation the further assumption is made that the rate of condensation on the stratified layer of liquid running along the bottom of the tube is negligible. Consequently, this layer of liquid must not exceed values assumed without being approximately accounted for. 

When water is used as a coolant, shell-and-tube units may be installed horizontally or vertically. Condensing may occur either on the tube side or the shell side. For air-cooled and eveporative-cooled condensers, the process elmost always is condensed inside horizontal tubes, although air-cooled units may be vertical or inclined. 

For film condensation inside horizontal tube, the Chato (1962) correlation is recommended for low vapor inlet Reynolds number (<35,000)... 

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