Thermal characteristics of a closed thermosyphon under various filling conditions

Numerical study of long-term cooling effects of thermosyphons around tower footings in permafrost regions along the Qinghai-Tibet Power Transmission Line

“…Schematic (a) and heat resistances (b) of a thermosyphon without an adiabatic section (after Zhang et al (2011) and Shabgard et al (2014)). l c , l e , l p , are lengths of the condenser section, evaporator section and liquid pool of thermosyphon, T a , T co , T ci, T cl , T ei and T s are temperatures of the air, external pipe wall of the condenser section, inner pipe wall of the condenser section, working liquid, inner pip wall of the evaporator section, and foundation soils, respectively, and R 1 to R 5 are five heat resistances during the heat transfer processes in the air-thermosyphon-soil system.…”

Thermal performance and efficiency of a thermosyphon heat pipe working with a biologically ecofriendly nanofluid

“…They also showed that the striking feature of nanofluids is their superior thermal conductivity which sometimes is ten times larger than base fluids. Since then, numerous articles have been published that mainly focused on the prediction and measurement techniques in order to evaluate the thermal conductivity and performances of nanofluids in cooling systems and heat transfer devices particularly for thermosyphon heat pipes [2][3][4][5][6][7][8][9][10][11][12]. Applying nanofluids as working fluids in HPs is a novel, but phenomenal idea that can be found only in the recent literatures.…”

Experimental Analysis of Inclined Heat Pipe Thermal Resistancen

“…They claimed that thermosyphon with a filling ratio of 40 to 50 % resulted in lowest thermal resistance. Shabgard et al [9] investigated the heat pipe thermal performance with various filling ratios. They deduced that thermal resistance of the evaporator section will be decreased by increasing heat flux input.…”

“…for the inclination angle of 60° with filling ratio 100%; an acceptable temperature difference may be observed. To have a better judgment about heat pipe performance, the heat pipe thermal resistance is defined as bellow [13]: Figure 10, as it was mentioned correctly by Shabgard et al [9], by increasing the heat flux, the amount of thermal resistance will be decreased. Interestingly, regardless of inclination angle, in higher heat input the amount of thermal resistance is relatively independent of filling ratio.…”