In this paper,we propose and experimentally demonstrate a method to realize a polarization detector by using a commercially available polymethyl methacrylate（PMMA） pipe.An asymmetric polarization-related structure i...In this paper,we propose and experimentally demonstrate a method to realize a polarization detector by using a commercially available polymethyl methacrylate（PMMA） pipe.An asymmetric polarization-related structure is fabricated by etching different grating structures on the external surface of the pipe.The results show that when the pipe rotates up to 90°,the peak of the transmission spectrum can evidently shift towards the low frequency,which means the pipe with grating structures can serve as a polarization detector.This design possesses the merits of a simple structure and easy fabrication.展开更多
In this paper, a novel study on performance of closed loop pulsating heat pipe（CLPHP）using ammonia as working fluid is experimented. The tested CLPHP, consisting of six turns, is fully made of quartz glass tubes wit...In this paper, a novel study on performance of closed loop pulsating heat pipe（CLPHP）using ammonia as working fluid is experimented. The tested CLPHP, consisting of six turns, is fully made of quartz glass tubes with 6 mm outer diameter and 2 mm inner diameter. The filling ratio is50%. The visualization investigation is conducted to observe the oscillation and circulation flow in the CLPHP. In order to investigate the effects of inclination angles to thermal performance in the ammonia CLPHP, four case tests are studied. The trends of temperature fluctuation and thermal resistance as the input power increases at different inclination angles are highlighted. The results show that it is very easy to start up and circulate for the ammonia CLPHP at an inclining angle.The thermal resistance is low to 0.02 K/W, presenting that heat fluxes can be transferred from heating section to cooling section very quickly. It is found that the thermal resistance decreases as the inclination angle increases. At the horizontal operation, the ammonia CLPHP can be easy to start up at low input power, but hard to circulate. In this case, once the input power is high,the capillary tube in heating section will be burnt out, leading to worse thermal performance with high thermal resistance.展开更多
文摘In this paper,we propose and experimentally demonstrate a method to realize a polarization detector by using a commercially available polymethyl methacrylate（PMMA） pipe.An asymmetric polarization-related structure is fabricated by etching different grating structures on the external surface of the pipe.The results show that when the pipe rotates up to 90°,the peak of the transmission spectrum can evidently shift towards the low frequency,which means the pipe with grating structures can serve as a polarization detector.This design possesses the merits of a simple structure and easy fabrication.
基金supported by the National Natural Science Foundation of China (No. 51176190)
文摘In this paper, a novel study on performance of closed loop pulsating heat pipe（CLPHP）using ammonia as working fluid is experimented. The tested CLPHP, consisting of six turns, is fully made of quartz glass tubes with 6 mm outer diameter and 2 mm inner diameter. The filling ratio is50%. The visualization investigation is conducted to observe the oscillation and circulation flow in the CLPHP. In order to investigate the effects of inclination angles to thermal performance in the ammonia CLPHP, four case tests are studied. The trends of temperature fluctuation and thermal resistance as the input power increases at different inclination angles are highlighted. The results show that it is very easy to start up and circulate for the ammonia CLPHP at an inclining angle.The thermal resistance is low to 0.02 K/W, presenting that heat fluxes can be transferred from heating section to cooling section very quickly. It is found that the thermal resistance decreases as the inclination angle increases. At the horizontal operation, the ammonia CLPHP can be easy to start up at low input power, but hard to circulate. In this case, once the input power is high,the capillary tube in heating section will be burnt out, leading to worse thermal performance with high thermal resistance.
