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PRESSURE DROP CHARACTERISTICS OF R410A-OIL MIXTURE FLOW BOILING IN SMALL SMOOTH TUBES
Gao, Yifeng,Deng, Bin,Ding, Guoliang,Hu, Haitao,Huang, Xiangchao The Society of Air-Conditioning and Refrigerating 2010 International Journal Of Air-Conditioning and Refr Vol.18 No.2
This study presents experimental frictional pressure drop for R410A/oil mixture flow boiling in small horizontal smooth tubes with inside diameters of 4.18mm and 2.0 mm. Experimental conditions cover nominal oil concentrations from 0 to 5%. The test results show that the presence of oil enhances two-phase frictional pressure drop about 0-120% and 0-90% at present tee conditions for 4.18mm I.D. smooth tube and 2.0mm I.D. smooth tube, respectively, and the enhanced effect is more evident at higher vapor qualities where the local oil concentrations are higher. A new correlation to predict the local frictional pressure drop of R410A/oil mixture flow boiling inside conventional size and small smooth tubes is developed based on local properties of refrigerant-oil mixture, and the experimental data of 4.18mm I.D. and 2.0mm I.D. smooth tubes and that of 6.34mm I.D. smooth tube (Hu et al., 2008) are well-correlated with the new correlation.
PRESSURE DROP CHARACTERISTICS OF R410A-OIL MIXTURE FLOW BOILING IN SMALL SMOOTH TUBES
YIFENG GAO,BIN DENG,GUOLIANG DING,HAITAO HU,XIANGCHAO HUANG 대한설비공학회 2010 International Journal of Air-Conditioning and Refr Vol.18 No.2
This study presents experimental frictional pressure drop for R410A/oil mixture flow boiling in small horizontal smooth tubes with inside diameters of 4.18 mm and 2.0 mm. Experimental conditions cover nominal oil concentrations from 0 to 5%. The test results show that the presence of oil enhances two-phase frictional pressure drop about 0–120% and 0–90% at present test conditions for 4.18 mm I.D. smooth tube and 2.0 mm I.D. smooth tube, respectively, and the enhanced effect is more evident at higher vapor qualities where the local oil concentrations are higher. A new correlation to predict the local frictional pressure drop of R410A/oil mixture flow boiling inside conventional size and small smooth tubes is developed based on local properties of refrigerant–oil mixture, and the experimental data of 4.18 mm I.D. and 2.0 mm I.D. smooth tubes and that of 6.34 mm I.D. smooth tube (Hu et al., 2008) are well-correlated with the new correlation.
Optical Properties of a Nanofiber with Metal Cladding
Guoying Feng,Hao Zhou,Guorui Zhou,Hao Yang,Guoliang Deng,Shouhuan Zhou 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.41
We present a detailed report on the linear and the nonlinear optical properties of a nanofiber with metal cladding fabricated by using a flame stretch method and a vacuum deposition method. We numerically simulated the field distribution in a tapered nanofiber with different thicknesses of silver cladding. The results show that, due to the high-index contrast between the silica core and the silver cladding, the silica waveguide allows strong optical confinement and large effective nonlinearity. The supercontinuum generation based on a nanofiber with metal cladding is investigated theoretically and experimentally.
Huayuan Lin,Qiqi Huang,Xiaoquan Guo,Ping Liu,Weilian Liu,Yuelong Zou,Shuliang Zhu,Guangfu Deng,Jun Kuang,Caiying Zhang,Huabin Cao,Guoliang Hu 대한수의학회 2015 Journal of Veterinary Science Vol.16 No.4
To assess relationships between xanthine oxidase (XOD) and nephropathogenic infectious bronchitis virus (NIBV) infection, 240 growing layers (35 days old) were randomly divided into two groups (infected and control) of 120 chickens each. Each chicken in the control and infected group was intranasally inoculated with 0.2 mL sterile physiological saline and virus, respectively, after which serum antioxidant parameters and renal XOD mRNA expression in growing layers were evaluated at 8, 15 and 22 days post-inoculation (dpi). The results showed that serum glutathione peroxidase and superoxide dismutase activities in the infected group were significantly lower than in the control group at 8 and 15 dpi (p < 0.01), while serum malondialdehyde concentrations were significantly higher (p < 0.01). The serum uric acid was significantly higher than that of the control group at 15 dpi (p < 0.01). In addition, the kidney mRNA transcript level and serum activity of XOD in the infected group was significantly higher than that of the control group at 8, 15 and 22 dpi (p < 0.05). The results indicated that NIBV infection could cause the increases of renal XOD gene transcription and serum XOD activity, leading to hyperuricemia and reduction of antioxidants in the body.