Thermal Modulation and Airflow Distribution Determine Hair Drying Efficiency and Moisture Behavior in Human Hair: An Ex Vivo Study in South Korea

This ex vivo study conducted in the Republic of Korea investigated the efficiency of hair drying and moisture behavior in human hair using two different drying devices. The study used commercial Asian virgin hair tresses, some of which were chemically treated to simulate damage. Two drying modes were tested: a conventional dryer at a constant 80°C and a temperature-regulated dryer with alternating warm-cool modes. The study found that the temperature-regulated dryer with a nonfocused nozzle and alternating temperature settings was more effective in reducing internal moisture while minimizing damage to the hair cuticle, as observed through SEM imaging. The study also utilized infrared thermography and particle image velocimetry to assess temperature distribution and airflow characteristics, respectively. The results indicated that the test mode dryer provided a more concentrated airflow, leading to better drying efficiency and less hair fluttering compared to the conventional mode. Statistical analysis confirmed the significance of these findings with a p-value of less than 0.05.