ME3122-2 Lab Forced Convection Heat Transfer

S AMPLE C ALCULATION 1. Method 1: Lumped-heat-capacity method Table 4 Calculation of convective heat transfer coefficient Sphere Material

Aluminum

Brass

Teflon

-0.0377

-0.0736

-4.993

0.0042

0.0082

0.555

 

 

 

Gradient of curve

    ⁄  

Biot Number

Validity of the lumpedheat-capacity method

                    

Convective heat transfer coefficient

   

2. Method 2 Table 5 Calculation of convective heat transfer coefficient

              

Sphere Material

Gradient of curve

Aluminum

Brass

Teflon

-0.1621

-0.1316

-0.048



                   

    (            )                 24.150

 

          26.599

        6.047

              7