| 摘要 |
A self-regulating porous heater (100) solves the problem of regulating the temperature of a fluid passing through the heater (100) by using the skin effect. The heater (100) has a layer of porous material (102) which has a magnetic permeability inversely related to temperature over a given range. Due to conductor skin effects, changes in permeability cause changes in the depth of penetration of a.c. current passing through the magnetic layer (102). Changes in the depth of penetration, in turn, result in changes in resistance --the less the depth the greater the resistance-- and in I<2>R Joule heat. The combined result of these effects is to provide more heat where the temperature of the fluid and the porous layer (102) is below a specified temperature that is related to the layer's Curie temperature. In another embodiment, the heater (200) is a laminate structure made of a low resistance porous material layer (202) and a porous thermally conductive magnetic layer (204). By properly defining the pore dimensions, the porous layers (102, 202, and 204) can filter contaminants from a fluid as it flows through the heater. |
