Abstract: A two-phase immersion cooling apparatus including a coolant tank, at least one condenser, a heat transfer enhancer, and at least one heat dissipating component is provided. Vapor and liquid regions are formed in the coolant tank. Pressure enhanced and boiling regions are formed in the heat transfer enhancer. Accelerated flow and at least one recycling flow region are formed between the heat transfer enhancer and coolant tank. The at least one condenser is in thermal communication with the vapor region. The pressure enhanced and boiling regions and accelerated flow and at least one recycling flow region, are in fluid communication thereamong. A temperature and pressure within the pressure enhanced and boiling regions is greater than that within the at least one recycling flow region, maximizing heat absorption and enhancing vapor bubble nucleation, and accelerating fluid circulation from the at least one recycling flow region to the boiling region.

Abstract: A downhole device comprising: a body section, wherein the body section defines a cavity and has an inner diameter and an outer diameter and a nozzle section at a first end of the body section, wherein the nozzle section defines a cavity and has an inner diameter and an outer diameter.