Convective condensation of n-pentane working fluid inside a round 0.56 mm borosilicate tube is presented for a range of mass flow rates from 3.4 to 13.8 kg/(m~2s) corresponding to a range of liquid Reynolds numbers from 21.6 to 39.3. The transparency of the condenser allows the visualization of the condensation flow structures. Three flow regimes are observed according to the flow rate, corresponding to annular or annular-wavy, annular-bubbly and annular intermittent-bubbly flow. A procedure is presented for the experimental determination of the void fraction profile. The variation of the condensation length versus mass flow rate is also reported. In the last part, the average condensation pressure drop is investigated.
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