Based on the working of Lighthill and Hunt et al., in the present paper the author has established the topological rules adapting to analysing the skin-friction lines and the section streamlines in cascades. These rul...Based on the working of Lighthill and Hunt et al., in the present paper the author has established the topological rules adapting to analysing the skin-friction lines and the section streamlines in cascades. These rules are (1) for a rotor cascade without shroud band, the total number of nodal points equals that the saddle points on the skin-friction line vector fields in eachpitch range; (2) for an annular or straight cascade with no-clearances at blade ends, the total number of saddle points is two more than that of nodal points on the skin-friction line fields in a pitch; (3) the total number of saddles in the secondary flow fields on cross-sections in cascade is one less than that of nodes; (4) in the section streamline vector fields on a meridian surface penetrating a flow passage, and on leading and trailing edge sections, the total number of nodes is equal to that of saddles; (5) on the streamline vector fields of a blade-to-blade surface, the total number of nodes is one less than that of saddles.展开更多
This paper presents an analytical solution for the production function and pressure distribution function of flow in infinite stratified oil reservoir with crosflow under the condition of constant wellbore pressure (C...This paper presents an analytical solution for the production function and pressure distribution function of flow in infinite stratified oil reservoir with crosflow under the condition of constant wellbore pressure (CWP condition) by Weber's integral transformation. The calculation results are shown in the form of curves and these results can be used to analyse unsteady flow test of production with CWP condition.展开更多
According to a mathematical model for dense two-phase flows presented in the previous pape[1],a dense two-phase flow in a vertical pipeline is analytically solved, and the analytic expressions of velocity of each cont...According to a mathematical model for dense two-phase flows presented in the previous pape[1],a dense two-phase flow in a vertical pipeline is analytically solved, and the analytic expressions of velocity of each continuous phase and dispersed phase are respectively derived. The results show that when the drag force between twophasesdepends linearly on their relative velocity, the relative velocity profile in the pipeline coincides with Darcy's law except for the thin layer region near the pipeline wall, and that the theoretical assumptions in the dense two-phase flow theory mentioned are reasonable.展开更多
BACKGROUND Although gastroscopy is a commonly used diagnostic and therapeutic technique,postoperative gastrointestinal dysfunction is prone to occur.Traditional Chinese medicine theory suggests that postoperative gast...BACKGROUND Although gastroscopy is a commonly used diagnostic and therapeutic technique,postoperative gastrointestinal dysfunction is prone to occur.Traditional Chinese medicine theory suggests that postoperative gastrointestinal disorders are related to spleen and stomach weakness.This study hypothesizes that the combination of acupoint application at the Ziwu Liuzhu acupoint and percutaneous acupoint electrical stimulation can promote postoperative gastrointestinal function recovery and alleviate stress reactions.AIM To investigate the effects of acupoint application of Ziwu Liuzhu combined with percutaneous acupoint electrical stimulation on postoperative gastrointestinal function recovery and stress response in patients undergoing gastrointestinal endoscopy surgery.METHODS A total of 120 patients who underwent gastroscopy surgery were selected and treated between October 2024 and January 2025.This study used a stratified block randomization method,and then allocated groups using computer-generated random number sequences(SAS 9.4 software).The groups were divided into two groups:A control group of 60 patients who received routine postoperative intervention measures,and an observation group of 60 patients who received acupuncture point application combined with transcutaneous acupoint electrical CONCLUSION The combination of percutaneous acupoint electrical stimulation in gastroscopy patients has been demonstrated to be both highly safe and effective.The benefits of this approach include the promotion of postoperative gastrointestinal function,the reduction of stress response,the attainment of optimal results,and the enhancement of patient satisfaction.展开更多
In this paper, a modified κ-ε turbulence model, a simplified algebraic stress model and a developed two-fluid model have been presented based on numerical modeling of turbulent buoyant recirculating flows. The calcu...In this paper, a modified κ-ε turbulence model, a simplified algebraic stress model and a developed two-fluid model have been presented based on numerical modeling of turbulent buoyant recirculating flows. The calculated results by these models are in good agreement with experiments. However, the last model is much better for simulating gravity-stratified flows.展开更多
文摘Based on the working of Lighthill and Hunt et al., in the present paper the author has established the topological rules adapting to analysing the skin-friction lines and the section streamlines in cascades. These rules are (1) for a rotor cascade without shroud band, the total number of nodal points equals that the saddle points on the skin-friction line vector fields in eachpitch range; (2) for an annular or straight cascade with no-clearances at blade ends, the total number of saddle points is two more than that of nodal points on the skin-friction line fields in a pitch; (3) the total number of saddles in the secondary flow fields on cross-sections in cascade is one less than that of nodes; (4) in the section streamline vector fields on a meridian surface penetrating a flow passage, and on leading and trailing edge sections, the total number of nodes is equal to that of saddles; (5) on the streamline vector fields of a blade-to-blade surface, the total number of nodes is one less than that of saddles.
文摘This paper presents an analytical solution for the production function and pressure distribution function of flow in infinite stratified oil reservoir with crosflow under the condition of constant wellbore pressure (CWP condition) by Weber's integral transformation. The calculation results are shown in the form of curves and these results can be used to analyse unsteady flow test of production with CWP condition.
文摘According to a mathematical model for dense two-phase flows presented in the previous pape[1],a dense two-phase flow in a vertical pipeline is analytically solved, and the analytic expressions of velocity of each continuous phase and dispersed phase are respectively derived. The results show that when the drag force between twophasesdepends linearly on their relative velocity, the relative velocity profile in the pipeline coincides with Darcy's law except for the thin layer region near the pipeline wall, and that the theoretical assumptions in the dense two-phase flow theory mentioned are reasonable.
基金Supported by Zhejiang Province Traditional Chinese Medicine Science and Technology Plan Project,No.2023ZL230。
文摘BACKGROUND Although gastroscopy is a commonly used diagnostic and therapeutic technique,postoperative gastrointestinal dysfunction is prone to occur.Traditional Chinese medicine theory suggests that postoperative gastrointestinal disorders are related to spleen and stomach weakness.This study hypothesizes that the combination of acupoint application at the Ziwu Liuzhu acupoint and percutaneous acupoint electrical stimulation can promote postoperative gastrointestinal function recovery and alleviate stress reactions.AIM To investigate the effects of acupoint application of Ziwu Liuzhu combined with percutaneous acupoint electrical stimulation on postoperative gastrointestinal function recovery and stress response in patients undergoing gastrointestinal endoscopy surgery.METHODS A total of 120 patients who underwent gastroscopy surgery were selected and treated between October 2024 and January 2025.This study used a stratified block randomization method,and then allocated groups using computer-generated random number sequences(SAS 9.4 software).The groups were divided into two groups:A control group of 60 patients who received routine postoperative intervention measures,and an observation group of 60 patients who received acupuncture point application combined with transcutaneous acupoint electrical CONCLUSION The combination of percutaneous acupoint electrical stimulation in gastroscopy patients has been demonstrated to be both highly safe and effective.The benefits of this approach include the promotion of postoperative gastrointestinal function,the reduction of stress response,the attainment of optimal results,and the enhancement of patient satisfaction.
文摘In this paper, a modified κ-ε turbulence model, a simplified algebraic stress model and a developed two-fluid model have been presented based on numerical modeling of turbulent buoyant recirculating flows. The calculated results by these models are in good agreement with experiments. However, the last model is much better for simulating gravity-stratified flows.
