Osmotic pressure-driven two-phase fluid loop

Abstract

The invention discloses an osmotic pressure-driven two-phase fluid loop. The osmotic pressure-driven two-phase fluid loop is big in driving force; in addition, no energy supply is needed; stability ishigh; the heat transmission capacity is high; and the heat transmission distance is long. According to the osmotic pressure-driven two-phase fluid loop, a semipermeable membrane is arranged in a liquid accumulator or a liquid pipeline, and a solute soluble in a working medium is added to part of the working medium on the semipermeable membrane; the boiling point of the solute is higher than the temperature of an evaporator; and the semipermeable membrane is used for passing of the working medium and not for passing of the solute. According to the osmotic pressure-driven two-phase fluid loop,osmotic pressure is adopted as the driving force; operation of the two-phase fluid loop is achieved; a brand-new fluid loop driving manner is achieved; the loop is simple and practicable, the drivingforce is big, and the driving force is completely passive driving force; no energy supply is needed, and the problem of mechanical component loss does not exist; besides, the driving force is big, loop hot pipe driving force can be improved conspicuously, and the transmission distance and the heat transferring capacity are improved; and stability is high, a loop heat pipe can be in a fixed thermalconductive working state all the time, and the phenomenon of instability caused by heat leakage to the liquid accumulator by the evaporator is avoided.

Description

technical field [0001] The invention relates to the technical field of equipment heat dissipation, in particular to the efficient heat transfer of spacecraft and other electronic equipment on the ground, and in particular to a two-phase fluid circuit driven by osmotic pressure. Background technique [0002] The two-phase fluid circuit relies on the latent heat of the working fluid to achieve heat transfer. Compared with the single-phase fluid circuit and traditional heat pipes, it has the characteristics of large heat transfer, small temperature difference, long-distance heat transfer, and excellent temperature control characteristics. Due to the incomparable advantages of many other heat transfer devices, the two-phase fluid circuit has been a key development of spacecraft thermal control technology in the past ten years. [0003] According to the driving mode, the two-phase fluid circuit technology mainly includes: two-phase fluid circuit driven by mechanical pump and two-...

AI Technical Summary

Problems solved by technology

[0008] (1) The capillary driving force is not strong enough

For high power (above 1kW), ultra-long-distance heat transfer (such as greater than 30m), anti-gravity work or overload environment, the capillary driving force is not enough. The conventional loop heat pipe uses a 1μm capillary core, which is not suitable for ammonia working fluid. It can only provide a driving force of no more than 100kPa, and even if a 0.3μm capillary core is used, the capillary force does not exceed 300kPa, and reducing the pore size of the capillary core will also bring about problems related to the increase of liquid flow resistance in the core

[0009] (2) There is instability

The capillary wick sucks the liquid in the condenser back to the evaporator through capillary force. Only by capillary force, the liquid from the liquid pipeline to the liquid trunk is not stable enough. Once evaporation or boiling occurs, it is easy to cause unstable operation of the circuit (temperature fluctuations, backflow, temperature hysteresis, etc.) or even affect the liquid supply and cause failure

[0010] (3) Each branch in the parallel system will affect each other

When multiple evaporators are connected in parallel and the working conditions of each branch are different, there may be flow interference in each branch, insufficient liquid supply or start-up problems

Images