| 摘要 |
<p>An electrical heating device employs a metallic felt body through which fluid to be heated is passed. The felt may be of polycrystalline metal whiskers, or non-metal whiskers or filements with metal coating applied. The body is heated by contact with an element that is heated electrically The fluid flows through the body in a relatively long path compared with the distance through which heat has to be conducted through the body from said element. The body is conveniently a hollow cylinder, the fluid flow being parallel to the axis and the heat being applied from inner and outer tubes between which the felt body is disposed.</p> |
