Heat Transfer

| a i | ith coefficient of a series solution |
| A c | cross-sectional area (m2) |
| A min | minimum flow area (m2) |
| A p | projected area (m2) |
| A s | surface area (m2) |
| A s,fin | surface area of a fin (m2) |
| A tot | prime (total) surface area of a finned surface (m2) |
| AR | aspect ratio of a rectangular duct |
| AR tip | area ratio of fin tip to fin surface area |
| Att | attenuation (-) |
| B | parameter in the blowing factor (-) |
| BF | blowing factor (-) |
| Bi | Biot number (-) |
| Bo | boiling number (-) |
| Br | Brinkman number |
| c | specific heat capacity (J/kg-K) |
| concentration (-) | |
| speed of light (m/s) | |
| | specific heat capacity of an air-water mixture on a unit mass of air basis (J/kg a-K) |
| | specific heat capacity of an air-water mixture along the saturation line on a unit mass of air basis (J/kg a-K) |
| c eff | effective specific heat capacity of a composite (J/kg-K) |
| c ms | ratio of the energy carried by a micro-scale energy carrier to its temperature (J/K) |
| c v | specific heat capacity at constant volume (J/kg-K) |
| C | total heat capacity (J/K) |
| ? | capacitance rate of a flow (W/K) |
| C 1, C 2, | undetermined constants |
| C crit | dimensionless coefficient for critical heat flux correlation (-) |
| C D | drag coefficient (-) |
| C f | friction coefficient (-) |
| C f | average... |