Effect of laminar air flow on probe burn for spring probe
This paper investigates transient heat transfer between a heated spring probe and its air environment. A continuum finite volume simulation is used to analyze of heat flow within and from the resistively heated probe to its environment. Experimental results are conducted for spring probe with laminar air flow and without air flow. The numerical results and experimental results are compared and very good agreement is observed.
Wafer test probe burn modeling and characterization
This study investigates the wafer probe temperature distribution along a probe body in order to model probe burn phenomenon by using computational mechanics techniques. The finite volume software is used to study the effects of different materials and different geometrical factors on the temperature along a special design vertical/spring and cantilever probe. The computation shows higher temperatures towards the probe tip region as a result of Joule heating. The probe burn is also observed at the tip region of spring and cantilever probes in wafer testing. This is believed to be due to very low heat dissipation rates resulting from very small sizes compared to the probe body.
Heat Transfer of Fine-Wire Fuse
The thermal analysis, by hand calculation and computer, of the experimental data of fine-wire fuse "sealed" (in air) in tiny tube shows that the heat transfer through the air around the fine wire is the dominant heat loss mechanism. Even at the melting point of nickel, 1454°C, the radiation loss from a fine wire amounts to about ten percent of the total power loss and becomes comparable to the thermal conduction loss along the wire toward both cold ends. Results of the analysis also indicate the importance of three-dimensional effects, i.e., axial heat transfer in the air around the fine wire, especially for short wires at high temperatures. Experimentally, based on the comparison between his data on "sealed" (in air) and "vented" (in vacuum) fine-wire fuses, J. L. Olson has recommended a 40 percent derating in the threshold current, where the hot resistance of the fuse starts to rise fast. Based on the resistance versus current data of "sealed" and "vented" fuse made of 2.5 x 10-3cm diameter nickel wire measured by F. X. DeCurio and similar data by Kyte eta!. on 7.8 X 10-3cm diameter platinum wire at 66°C, we recommend that the blow power, where the fuse melts, of the vented (in vacuum) fuse should be derated by a factor of 11. Mathematically, the insignificance of the radiation loss at temperatures below 1400 K lends the heat equation, which includes the positive temperature coefficient of the thermal conductivity of the air and that of the electrical resistivity of the wire, solvable in terms of elliptical integral of the first kind.