A cold air chamber is proposed for quenching steel
Chapter 5, Problem 5.72(choose chapter or problem)
A cold air chamber is proposed for quenching steel ballbearings of diameter D?0.2 m and initial temperatureTi?400C. Air in the chamber is maintained at?15Cby a refrigeration system, and the steel balls passthrough the chamber on a conveyor belt. Optimumbearing production requires that 70% of the initial ther-mal energy content of the ball above?15C beremoved. Radiation effects may be neglected, and theconvection heat transfer coefficient within the chamberis 1000 W/m2?K. Estimate the residence time of theballs within the chamber, and recommend a drive veloc-ity of the conveyor. The following properties may beused for the steel: k?50 W/m?K, ??210?5m2/s,and c?450 J/kg?K
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer