TY - JOUR
T1 - The influence of horizontal longitudinal vibrations and the condensation section temperature on the heat transfer performance ofa heat pipe
AU - Chen, Rong Horng
AU - Lin, Yung Jen
AU - Lai, Chi Ming
N1 - Funding Information:
Support from the National Science Council of ROC through grant NSC 100-2221-E-218 -048 -MY2 in this study is gratefully acknowledged.
PY - 2013/1/1
Y1 - 2013/1/1
N2 - This study is primarily focused on the influence of horizontal longitudinal vibrations and the condensation section temperature on the heat transfer performance of a grooved cylindrical copper heat pipe, with a length of 600mm and an outer diameter of 8mm. Longitudinal vibrations with frequencies of 3, 4, 5, 6, and 9Hz and amplitudes of 2.8, 5, 10, 15, 20, and 25mm, which would give accelerations in the range of 0.1-1.01g, were experimentally tested. The condensation section temperature was set at 20, 30, or 40C. A heating jacket and a cooling sleeve were installed at the evaporation and condensation sections of the test cell to mimic a constant heat flux and a constant temperature boundary, respectively. When the heat pipe started to vibrate horizontally in the longitudinal direction, this vibration caused an increase in the heat transfer of the heat pipe that was directly proportional to the input vibration energy below 500mm 2 Hz 2. When the value of the vibration energy exceeded this value, the heat transfer enhancement per unit vibration energy decreased rapidly. Along with the decrease in the condensation section temperature, the average temperature of the heating section decreases. The influence of the condensation section temperature on the maximum heat transfer is much greater than that of the vibrations.
AB - This study is primarily focused on the influence of horizontal longitudinal vibrations and the condensation section temperature on the heat transfer performance of a grooved cylindrical copper heat pipe, with a length of 600mm and an outer diameter of 8mm. Longitudinal vibrations with frequencies of 3, 4, 5, 6, and 9Hz and amplitudes of 2.8, 5, 10, 15, 20, and 25mm, which would give accelerations in the range of 0.1-1.01g, were experimentally tested. The condensation section temperature was set at 20, 30, or 40C. A heating jacket and a cooling sleeve were installed at the evaporation and condensation sections of the test cell to mimic a constant heat flux and a constant temperature boundary, respectively. When the heat pipe started to vibrate horizontally in the longitudinal direction, this vibration caused an increase in the heat transfer of the heat pipe that was directly proportional to the input vibration energy below 500mm 2 Hz 2. When the value of the vibration energy exceeded this value, the heat transfer enhancement per unit vibration energy decreased rapidly. Along with the decrease in the condensation section temperature, the average temperature of the heating section decreases. The influence of the condensation section temperature on the maximum heat transfer is much greater than that of the vibrations.
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U2 - 10.1080/01457632.2013.694776
DO - 10.1080/01457632.2013.694776
M3 - Article
AN - SCOPUS:84866363544
SN - 0145-7632
VL - 34
SP - 45
EP - 53
JO - Heat Transfer Engineering
JF - Heat Transfer Engineering
IS - 1
ER -