Frost formation and frost meltwater drainage characteristics on aluminum surfaces with grooved structures

摘要: Abstract Frost frequently forms on refrigeration and cryogenic engineering systems. finned surfaces increases the air-side thermal resistance reduces airflow area, which consequently reduce heat transfer rate. Structured fin may be an effective solution to delay frost formation promote meltwater drainage. This study experimentally studied condensation, crystal growth, melting drainage characteristics aluminum with parallel crossed grooves comparisons these effects a flat surface. The results show that condensed droplets freeze later less accumulation grooved than surface prefers grow at top edges corners of structures instead inside surfaces. During melting, melts breaks up into small streams or between has better smaller retention ratio, while worse In addition, ratio is related thickness. Lower temperatures longer frosting time in more larger films, are easily shed from by gravity so smaller.