Shell-side cross-flow importance

I ve read about the importance of shell-side cross-flow in heat-exchanger design books. Higher cross-flow velocities reduce film resistance and promote increased heat-transfer rates. Recently, I had a dramatic personal experience to support this engineering principle. 

Distribution problems. Uniform distribution is important when vapor entering the condenser splits into parallel streams (e.g., tube-side condensers, cross or split-flow shell-side condensers) (188, 381). High entrance resistances and multiple inlets are often used to gain good dis-... 

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