Pressure distribution inside oscillating heat pipe charged with aqueous Al2O3 nanoparticles, MWCNTs and their hybrid
来源期刊：中南大学学报(英文版)2014年第6期
论文作者：Md. Riyad Tanshen Sinil Lee Junhyo Kim Donghoon Kang Jungpil Noh HanShik Chung HyoMin Jeong Sunchul Huh
文章页码：2341 - 2348
Key words：oscillating heat pipe; pressure fluctuation; thermal resistance; nanofluids
Abstract: Effective thermal performance of oscillating heat pipe (OHP) is driven by inside pressure distribution. Heat transfer phenomena were reported in terms of pressure and frequency of pressure fluctuation in multi loop OHP charged with aqueous Al2O3 and MWCNTs/Al2O3 nanoparticles. The influences on thermal resistance of aqueous Al2O3, MWCNTs as well as the hybrid of them in OHP having 3 mm in inner diameter were investigated at 60% filling ratio. Experimental results show that thermal characteristics are significantly inter-related with pressure distribution and strongly depend upon the number of pressure fluctuations with time. Frequency of pressure depends upon the power input in evaporative section. A little inclusion of MWCNTs into aqueous Al2O3 at 60% filling ratio achieves the highest fluctuation frequency and the lowest thermal resistance at any evaporator power input though different nanofluids cause different thermal performances of OHPs.
Md. Riyad Tanshen1, Sinil Lee1, Junhyo Kim2, Donghoon Kang3, Jungpil Noh4, HanShik Chung4, HyoMin Jeong4, Sunchul Huh4
(1. Department of Energy and Mechanical Engineering, Gyeongsang National University,
Cheondaegukchi-Gil 38, Tongyeong, Gyeongnam 650-160, Korea;
2. Department of Marine Engineering, Mokpo National Maritime University,
Haeyangdaehak-ro 91, Mokpo-si, Jeollanam-do 530-729, Korea;
3. Department of Naval Architecture and Ocean Engineering, Gyeongsang National University,
Institute of Marine Industry, Cheondaegukchi-Gil 38, Tongyeong, Gyeongnam 650-160, Korea;
4. Department of Energy and Mechanical Engineering, Gyeongsang National University, Institute of Marine Industry, Cheondaegukchi-Gil 38, Tongyeong, Gyeongnam 650-160, Korea)
Abstract:Effective thermal performance of oscillating heat pipe (OHP) is driven by inside pressure distribution. Heat transfer phenomena were reported in terms of pressure and frequency of pressure fluctuation in multi loop OHP charged with aqueous Al2O3 and MWCNTs/Al2O3 nanoparticles. The influences on thermal resistance of aqueous Al2O3, MWCNTs as well as the hybrid of them in OHP having 3 mm in inner diameter were investigated at 60% filling ratio. Experimental results show that thermal characteristics are significantly inter-related with pressure distribution and strongly depend upon the number of pressure fluctuations with time. Frequency of pressure depends upon the power input in evaporative section. A little inclusion of MWCNTs into aqueous Al2O3 at 60% filling ratio achieves the highest fluctuation frequency and the lowest thermal resistance at any evaporator power input though different nanofluids cause different thermal performances of OHPs.
Key words:oscillating heat pipe; pressure fluctuation; thermal resistance; nanofluids
