Abstract: A method for designing startup critical tube diameter of pulsating heat pipe in vertical state, including the following steps: step 1. establishing a first model of working medium mass in pulsating heat pipe; step 2. establishing a second model of working medium mass in pulsating heat pipe, the second model including the vapor working medium mass model and the liquid working medium mass model in the pulsating heat pipe; step 3. according to the law of conservation of mass, combining the first model and the second model, and determining the volume percentage of the liquid working medium in the total length of the pulsating heat pipe under the condition of heat addition; step 4.

Abstract: A liquid metal high-temperature oscillating heat pipe and a testing system are provided. The testing system contains the high-temperature oscillating heat pipe, a high-temperature heating furnace, a cooling liquid block, a high-pressure pump, a constant temperature liquid bath, a mass flowmeter, a filter, a cooling liquid valve, and a measurement and control connected to the aforementioned devices. The constant temperature liquid bath, the high-pressure pump, the filter, the cooling liquid valve, a liquid filling port tee-junction, the cooling liquid block, a liquid outlet tee-junction, and the mass flowmeter are connected in sequence and the mass flowmeter is connected to the constant temperature liquid bath. The front side of the cooling liquid block is provided with a channel connected to a condenser of the high-temperature oscillating heat pipe. The adiabatic section of the high-temperature oscillating heat pipe being connected to the high-temperature heating furnace.

Abstract: A method for designing startup critical tube diameter of pulsating heat pipe in vertical state, including the following steps: step 1. establishing a first model of working medium mass in pulsating heat pipe; step 2. establishing a second model of working medium mass in pulsating heat pipe, the second model including the vapor working medium mass model and the liquid working medium mass model in the pulsating heat pipe; step 3. according to the law of conservation of mass, combining the first model and the second model, and determining the volume percentage of the liquid working medium in the total length of the pulsating heat pipe under the condition of heat addition; step 4.