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The second law of thermodynamics can be described as the non-decreasing ofthe entropy in the irreversible thermodynamic process. Such phenomenon can bequantitatively evaluated with the irreversible entropy generation (IEG), whichwas recently found to follow a $1/\tau$ scaling for the system under a longcontact time $\tau$ with the thermal bath. This scaling, predicted in manyfinite-time thermodynamic models, is of great potential in the optimization ofheat engines, yet remains lack of direct experimental validation. In thisletter, we design an experimental apparatus to test such scaling by compressingdry air in a temperature-controlled water bath. More importantly, wequantitatively verify the optimized control protocol to reduce the IEG. Suchoptimization shall bring new insight to the practical design of heat enginecycles.

Experimental validation of the $1/\tau$ -scaling entropy generation in finite-time thermodynamics with dry air