| 摘要 |
Apparatus and methods to dissipate heat in a downhole tool are disclosed. A disclosed example tool collar includes a body having a first outer surface, a first fluid inlet, and a first fluid outlet. The example tool collar also includes a passageway formed therethrough, a second fluid inlet to engage the first fluid outlet of the body, a second fluid outlet to engage the first fluid inlet of the body, and a first inner surface having at least one protrusion extending into the passageway.
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