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Dan Herring is president of THE HERRING GROUP Inc., which specializes in consulting services (heat treatment and metallurgy) and technical services (industrial education/training and process/equipment assistance). He is also a research associate professor at the Illinois Institute of Technology/Thermal Processing Technology Center. tel: 630-834-3017; e-mail: dherring@heat-treat-doctor.com; web: www.heat-treat-doctor.com
The basic formula for heating by convection (in one form) is given by Equation 1.
Fig. 1. Initial conditions for convective heating
Here’s how this formula is derived and used. We begin by establishing some initial conditions for convection heating (Fig. 1).
Fig. 2. General heating characteristics
Assume that we are heating in a batch-style furnace or oven where we have the following general heating characteristics (Fig. 2).
In practice, it is difficult to achieve the conditions for (11b), thus (12) is generally used for steel. For aluminum, the factor becomes 0.9 rather than 0.67.
Dan Herring is president of THE HERRING GROUP Inc., which specializes in consulting services (heat treatment and metallurgy) and technical services (industrial education/training and process/equipment assistance). He is also a research associate professor at the Illinois Institute of Technology/Thermal Processing Technology Center. tel: 630-834-3017; e-mail: dherring@heat-treat-doctor.com; web: www.heat-treat-doctor.com
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