Flat plate pulsating heat pipe is useful for hot spot heat spreader. Two kinds of flat plate spreader of pulsating heat pipe are designed, fabricated and experimented. For the embedded circular capillary type, the tra...Flat plate pulsating heat pipe is useful for hot spot heat spreader. Two kinds of flat plate spreader of pulsating heat pipe are designed, fabricated and experimented. For the embedded circular capillary type, the transferred heat flux could reach 32 W/cm2, the smallest thermal resistance for acetone, methanol and FC-72 were respectively 0.50, 0.57 and 0.40℃/W. While for the square capillary type, the transferred heat flux could reach 26 W/cm2, the equivalent thermal conductivity could reach 3211 W/（m. ℃）. There are ranges of optimal transferred power and filling ratio for different working liquid. If the transferred power is constant, changing the heating area and the place has little effects on the performance.展开更多
Based on scanning electron microscopy and mercury porosimmetry,a large number of experimental data of pores and pore throats of tight sandstone reservoirs are obtained,and the characteristics of pore types,capillary p...Based on scanning electron microscopy and mercury porosimmetry,a large number of experimental data of pores and pore throats of tight sandstone reservoirs are obtained,and the characteristics of pore types,capillary pressure curves and quantitative parameters of pore throats of Yanchang Formation in Huangling mining area are studied.The results show that the main reservoir space types of Yanchang Formation sandstone are primary intergranular pores and feldspar dissolution pores.The pore-throat structure is medium-small pore and thin-small throat type,and the sorting is good to medium.The mercury porosimmetry curve shows a slightly coarse-thin skew.Combining the morphological characteristics of the mercury porosimmetry capillary pressure curve and the quantitative parameter characteristics of pore throats,the Yanchang Formation s micro pore structure is divided into types I,II,III,and IV.Tight oil reservoirs with type I and II pore structure characteristics are favorable.This study has reference significance for the later evaluation of tight sandstone reservoirs in Huangling mining area.展开更多
制冷剂流动噪声特别是毛细管喷发噪声是影响冰箱、冷柜等小型家用制冷设备声品质的主要因素,然而制冷剂流动噪声由于理论难度高、隐蔽性强,较少有专门的系统研究。基于制冷剂流动特性和流体网络理论开展了某型号冷冻柜的流动噪声发生机...制冷剂流动噪声特别是毛细管喷发噪声是影响冰箱、冷柜等小型家用制冷设备声品质的主要因素,然而制冷剂流动噪声由于理论难度高、隐蔽性强,较少有专门的系统研究。基于制冷剂流动特性和流体网络理论开展了某型号冷冻柜的流动噪声发生机理理论研究;基于理论分析结果,提出了一种改进的的毛细管过渡管结构设计方案;实验研究结果表明该改进设计措施能够有效抑制毛细管出口的喷射噪声,对整机噪声有约3 d B(A)的消声量。该研究成果丰富了小型制冷系统内部流动设计理论和噪声抑制机理,能够为指导小型家电制冷系统新过渡管消声装置设计和改善声品质提供重要参考。展开更多
The dynamic mathematical model of the damping capillary type spherical hydrostatic bearing is established firstly,then the dynamic characteristics of the hydrostatic bearing are analysized in detail.By means of theore...The dynamic mathematical model of the damping capillary type spherical hydrostatic bearing is established firstly,then the dynamic characteristics of the hydrostatic bearing are analysized in detail.By means of theoretical reasoning,a design guide that relates to J0,the static stiffness of the hydrostatic bearing,is put forward to guarantee that the hydrostatic bearing possesses the excellent dynamic characteristics.At last,the effect of the structural parameters on J0 is studied.展开更多
文摘Flat plate pulsating heat pipe is useful for hot spot heat spreader. Two kinds of flat plate spreader of pulsating heat pipe are designed, fabricated and experimented. For the embedded circular capillary type, the transferred heat flux could reach 32 W/cm2, the smallest thermal resistance for acetone, methanol and FC-72 were respectively 0.50, 0.57 and 0.40℃/W. While for the square capillary type, the transferred heat flux could reach 26 W/cm2, the equivalent thermal conductivity could reach 3211 W/（m. ℃）. There are ranges of optimal transferred power and filling ratio for different working liquid. If the transferred power is constant, changing the heating area and the place has little effects on the performance.
文摘Based on scanning electron microscopy and mercury porosimmetry,a large number of experimental data of pores and pore throats of tight sandstone reservoirs are obtained,and the characteristics of pore types,capillary pressure curves and quantitative parameters of pore throats of Yanchang Formation in Huangling mining area are studied.The results show that the main reservoir space types of Yanchang Formation sandstone are primary intergranular pores and feldspar dissolution pores.The pore-throat structure is medium-small pore and thin-small throat type,and the sorting is good to medium.The mercury porosimmetry curve shows a slightly coarse-thin skew.Combining the morphological characteristics of the mercury porosimmetry capillary pressure curve and the quantitative parameter characteristics of pore throats,the Yanchang Formation s micro pore structure is divided into types I,II,III,and IV.Tight oil reservoirs with type I and II pore structure characteristics are favorable.This study has reference significance for the later evaluation of tight sandstone reservoirs in Huangling mining area.
文摘制冷剂流动噪声特别是毛细管喷发噪声是影响冰箱、冷柜等小型家用制冷设备声品质的主要因素,然而制冷剂流动噪声由于理论难度高、隐蔽性强,较少有专门的系统研究。基于制冷剂流动特性和流体网络理论开展了某型号冷冻柜的流动噪声发生机理理论研究;基于理论分析结果,提出了一种改进的的毛细管过渡管结构设计方案;实验研究结果表明该改进设计措施能够有效抑制毛细管出口的喷射噪声,对整机噪声有约3 d B(A)的消声量。该研究成果丰富了小型制冷系统内部流动设计理论和噪声抑制机理,能够为指导小型家电制冷系统新过渡管消声装置设计和改善声品质提供重要参考。
文摘The dynamic mathematical model of the damping capillary type spherical hydrostatic bearing is established firstly,then the dynamic characteristics of the hydrostatic bearing are analysized in detail.By means of theoretical reasoning,a design guide that relates to J0,the static stiffness of the hydrostatic bearing,is put forward to guarantee that the hydrostatic bearing possesses the excellent dynamic characteristics.At last,the effect of the structural parameters on J0 is studied.
