(Solution) - Bubble cap trays were widely used in the design of trayed -(2025 Original AI-Free Solution)

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Bubble-cap trays were widely used in the design of trayed towers prior to the 1960s. Today sieve and valve trays are favored. However, bubble-cap trays are still occasionally specified, especially for operations that require very high turndown ratios or appreciable liquid residence time. What characteristics of bubble-cap trays make it possible for them to operate satisfactorily at low vapor and liquid rates?