冷却塔实验室模型英文文献和中文翻译(5)
investigated, and, on the other hand, it is close to the initial temperature of the water in industrial cooling towers.
Figure 2 presents in dimensionless form the changes in the temperature AT/T a of the vapor-air mixture
with the height z/H. The experimental data relate to the axis of the model in the absence (Fig. 2a) and presence
(Fig. 2b) of wind at S = 2 for three cases: the standard mode of operation of the cooling tower, with one-sided
swirling of the flow (the angle of rotation of the plates is 45~ and with two-sided circulation (symmetric with
respect to the wind direction).
As follows from the experimental data presented in Fig. 2, for the conventional mode of tower operation
and for the mode with swirling the mixing of the flows terminates approximately at the height z/H = 0.3. It should
be noted that in the presence of flow circulation at the bottom of the model the temperature of the vapor-air mixture
is much higher (curve 2) than in the usual mode (curve 1).
As seen from Fig. 2b, a strong wind (S = 2) has a large influence on the temperature distribution inside
the tower: a general decrease in the temperature of the vapor-air mixture along the tower axis above the water
distributor is observed. As noted above, in this case the behavior of curve 1 can be explained by the appearance of
large stagnant zones having a vertical dimension of the order of 0.6H.
One-sided swirling of the incoming flow completely eliminates the effect of the formation of stagnant zones
(curves 2). In the case of symmetric swirling (curves 3) with and without wind one observes a general lowering in
the temperature of the ascending vapor-air flow along the tower axis. The data on the velocity field inside of the
model obtained by the authors are given in [3 ].
Figure 3 shows profiles of rms temperature oscillations along the model axis, nondimensionalized by the
mean temperature of the vapor-air mixture'at a given point and obtained under the same conditions as in Fig. 2. It can be noted that a lower level of temperature oscillations is observed in the case of symmetric swirling of the
flow (curves 3). From the figures it is seen that the distribution of the amplitude of the oscillations along the height
of the model has a rather complex character and depends on the conditions of the entry of the external air flow
into the tower. Using the analogy between the processes of heat and momentum transfer it can be assumed that
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