The Experts below are selected from a list of 1323 Experts worldwide ranked by ideXlab platform

R.d. Coffield - One of the best experts on this subject based on the ideXlab platform.

  • Qualification of a Method to Calculate the Irrecoverable Pressure Loss in High Reynolds Number Piping Systems
    2003
    Co-Authors: K. C. Sigg, R.d. Coffield
    Abstract:

    High Reynolds number test data has recently been reported for both single and multiple Piping elbow design Configurations at earlier ASME Fluid Engineering Division conferences. The data of these studies ranged up to a Reynolds number of 42 x 10[sup]6 which is significantly greater than that used to establish design correlations before the data was available. Many of the accepted design correlations, based on the lower Reynolds number data, date back as much as fifty years. The new data shows that these earlier correlations are extremely conservative for high Reynolds number applications. Based on the recent high Reynolds number information a new recommended method has been developed for calculating irrecoverable pressure loses in Piping systems for design considerations such as establishing pump sizing requirements. This paper describes the recommended design approach and additional testing that has been performed as part of the qualification of the method. This qualification testing determined the irrecoverable pressure loss of a Piping Configuration that would typify a limiting Piping section in a complicated Piping network, i.e., multiple, tightly coupled, out-of-plane elbows in series under high Reynolds number flow conditions. The overall pressure loss measurements were then compared to predictions, which used the new methodology tomore » assure that conservative estimates for the pressure loss (of the type used for pump sizing) were obtained. The recommended design methodology, the qualification testing and the comparison between the predictions and the test data are presented. A major conclusion of this study is that the recommended method for calculating irrecoverable pressure loss in Piping systems is conservative yet significantly lower than predicted by early design correlations that were based on the extrapolation of low Reynolds number test data.« less

  • Qualification of a Method to Calculate the Irrecoverable Pressure Loss in High Reynolds Number Piping Systems
    2002
    Co-Authors: K. C. Sigg, R.d. Coffield
    Abstract:

    High Reynolds number test data has recently been reported for both single and multiple Piping elbow design Configurations at earlier ASME Fluid Engineering Division conferences. The data of these studies ranged up to a Reynolds number of 42 x 10[sup]6 which is significantly greater than that used to establish design correlations before the data was available. Many of the accepted design correlations, based on the lower Reynolds number data, date back as much as fifty years. The new data shows that these earlier correlations are extremely conservative for high Reynolds number applications. Based on the recent high Reynolds number information a new recommended method has been developed for calculating irrecoverable pressure loses in Piping systems for design considerations such as establishing pump sizing requirements. This paper describes the recommended design approach and additional testing that has been performed as part of the qualification of the method. This qualification testing determined the irrecoverable pressure loss of a Piping Configuration that would typify a limiting Piping section in a complicated Piping network, i.e., multiple, tightly coupled, out-of-plane elbows in series under high Reynolds number flow conditions. The overall pressure loss measurements were then compared to predictions, which used the new methodology to assure that conservative estimates for the pressure loss (of the type used for pump sizing) were obtained. The recommended design methodology, the qualification testing and the comparison between the predictions and the test data are presented. A major conclusion of this study is that the recommended method for calculating irrecoverable pressure loss in Piping systems is conservative yet significantly lower than predicted by early design correlations that were based on the extrapolation of low Reynolds number test data.

Gabi Martin - One of the best experts on this subject based on the ideXlab platform.

  • Experimental investigation of an annular diffuser for axial fans at different inflow profiles
    2017
    Co-Authors: Walter Johannes, Wurz Dieter, Hartig Stefan, Gabi Martin
    Abstract:

    Axial fans are used in power plants for fresh air supply and flue gas transport. A typical Configuration consists of an axial fan and annular diffuser which connects the fan to the following Piping. In order to achieve a high efficiency of the con-figuration, not only the components have to be optimized but also their interaction. The present study focuses on the diffuser of the Configuration. Experiments are performed on a diffuser-Piping Configuration to investigate the influence of the velocity profile at the fan outlet on the pressure recovery of the Configuration. Two different diffuser inlet profiles are generated, an undisturbed profile and a profile with the typical outlet characteristics of a fan. The latter is generated by the superposition of screens in the inlet zone. The tests are conducted at a high Reynolds number (Re ≈ 4∙105). Mean velocity profiles and wall shear stresses are measured with hydraulic methods (Prandtl and Preston tubes). The results show that there is a lack of momentum at the outer wall of the diffuser and high shear stresses at the inner wall in case of the undisturbed inflow profile. For the typical fan outlet profile it is vice versa. There are high wall shear stresses at the outer wall while the boundary layer of the inner wall lacks momentum. The pressure recovery of the undisturbed inflow Configuration is in good agreement with other studies

  • Experimental investigation of an annular diffuser for axial flow fan Configurations at different inflow profiles
    2017
    Co-Authors: Walter Johannes, Wurz Dieter, Hartig Stefan, Gabi Martin
    Abstract:

    Axial fans are used in power plants for fresh air supply and flue gas transport. A typical Configuration consists of an axial fan and annular diffuser which connects the fan to the following Piping. In order to achieve a high efficiency of the con-figuration not only the components have to be optimized but also their interac-tion. The present study focuses on the diffuser of the Configuration. Experiments are performed on a diffuser-Piping Configuration in order to investigate the influ-ence of the velocity profile of the fan outlet on the pressure recovery of the con-figuration. Two different diffuser inlet profiles are generated, a homogeneous profile and a profile with the typical outlet characteristics of a fan. The latter is generated by the superposition of screens in the inlet zone. The tests are conduct-ed at a high Reynolds number (Re≈4∙10^5). Mean velocity profiles and wall shear stresses are measured with hydraulic methods (Prandtl and Preston tubes). The results show that there is a lack of momentum at the outer wall of the diffuser and high shear stresses at the inner wall in case of the homogeneous inflow pro-file. For the typical fan outlet profile it can be shown that there is an opposite ef-fect with high wall shear stresses at the outer wall while the boundary layer of the inner wall lacks momentum. The pressure recovery of the Configuration is in good agreement with previous studies

K. C. Sigg - One of the best experts on this subject based on the ideXlab platform.

  • Qualification of a Method to Calculate the Irrecoverable Pressure Loss in High Reynolds Number Piping Systems
    2003
    Co-Authors: K. C. Sigg, R.d. Coffield
    Abstract:

    High Reynolds number test data has recently been reported for both single and multiple Piping elbow design Configurations at earlier ASME Fluid Engineering Division conferences. The data of these studies ranged up to a Reynolds number of 42 x 10[sup]6 which is significantly greater than that used to establish design correlations before the data was available. Many of the accepted design correlations, based on the lower Reynolds number data, date back as much as fifty years. The new data shows that these earlier correlations are extremely conservative for high Reynolds number applications. Based on the recent high Reynolds number information a new recommended method has been developed for calculating irrecoverable pressure loses in Piping systems for design considerations such as establishing pump sizing requirements. This paper describes the recommended design approach and additional testing that has been performed as part of the qualification of the method. This qualification testing determined the irrecoverable pressure loss of a Piping Configuration that would typify a limiting Piping section in a complicated Piping network, i.e., multiple, tightly coupled, out-of-plane elbows in series under high Reynolds number flow conditions. The overall pressure loss measurements were then compared to predictions, which used the new methodology tomore » assure that conservative estimates for the pressure loss (of the type used for pump sizing) were obtained. The recommended design methodology, the qualification testing and the comparison between the predictions and the test data are presented. A major conclusion of this study is that the recommended method for calculating irrecoverable pressure loss in Piping systems is conservative yet significantly lower than predicted by early design correlations that were based on the extrapolation of low Reynolds number test data.« less

  • Qualification of a Method to Calculate the Irrecoverable Pressure Loss in High Reynolds Number Piping Systems
    2002
    Co-Authors: K. C. Sigg, R.d. Coffield
    Abstract:

    High Reynolds number test data has recently been reported for both single and multiple Piping elbow design Configurations at earlier ASME Fluid Engineering Division conferences. The data of these studies ranged up to a Reynolds number of 42 x 10[sup]6 which is significantly greater than that used to establish design correlations before the data was available. Many of the accepted design correlations, based on the lower Reynolds number data, date back as much as fifty years. The new data shows that these earlier correlations are extremely conservative for high Reynolds number applications. Based on the recent high Reynolds number information a new recommended method has been developed for calculating irrecoverable pressure loses in Piping systems for design considerations such as establishing pump sizing requirements. This paper describes the recommended design approach and additional testing that has been performed as part of the qualification of the method. This qualification testing determined the irrecoverable pressure loss of a Piping Configuration that would typify a limiting Piping section in a complicated Piping network, i.e., multiple, tightly coupled, out-of-plane elbows in series under high Reynolds number flow conditions. The overall pressure loss measurements were then compared to predictions, which used the new methodology to assure that conservative estimates for the pressure loss (of the type used for pump sizing) were obtained. The recommended design methodology, the qualification testing and the comparison between the predictions and the test data are presented. A major conclusion of this study is that the recommended method for calculating irrecoverable pressure loss in Piping systems is conservative yet significantly lower than predicted by early design correlations that were based on the extrapolation of low Reynolds number test data.

Walter Johannes - One of the best experts on this subject based on the ideXlab platform.

  • Experimental investigation of an annular diffuser for axial fans at different inflow profiles
    2017
    Co-Authors: Walter Johannes, Wurz Dieter, Hartig Stefan, Gabi Martin
    Abstract:

    Axial fans are used in power plants for fresh air supply and flue gas transport. A typical Configuration consists of an axial fan and annular diffuser which connects the fan to the following Piping. In order to achieve a high efficiency of the con-figuration, not only the components have to be optimized but also their interaction. The present study focuses on the diffuser of the Configuration. Experiments are performed on a diffuser-Piping Configuration to investigate the influence of the velocity profile at the fan outlet on the pressure recovery of the Configuration. Two different diffuser inlet profiles are generated, an undisturbed profile and a profile with the typical outlet characteristics of a fan. The latter is generated by the superposition of screens in the inlet zone. The tests are conducted at a high Reynolds number (Re ≈ 4∙105). Mean velocity profiles and wall shear stresses are measured with hydraulic methods (Prandtl and Preston tubes). The results show that there is a lack of momentum at the outer wall of the diffuser and high shear stresses at the inner wall in case of the undisturbed inflow profile. For the typical fan outlet profile it is vice versa. There are high wall shear stresses at the outer wall while the boundary layer of the inner wall lacks momentum. The pressure recovery of the undisturbed inflow Configuration is in good agreement with other studies

  • Experimental investigation of an annular diffuser for axial flow fan Configurations at different inflow profiles
    2017
    Co-Authors: Walter Johannes, Wurz Dieter, Hartig Stefan, Gabi Martin
    Abstract:

    Axial fans are used in power plants for fresh air supply and flue gas transport. A typical Configuration consists of an axial fan and annular diffuser which connects the fan to the following Piping. In order to achieve a high efficiency of the con-figuration not only the components have to be optimized but also their interac-tion. The present study focuses on the diffuser of the Configuration. Experiments are performed on a diffuser-Piping Configuration in order to investigate the influ-ence of the velocity profile of the fan outlet on the pressure recovery of the con-figuration. Two different diffuser inlet profiles are generated, a homogeneous profile and a profile with the typical outlet characteristics of a fan. The latter is generated by the superposition of screens in the inlet zone. The tests are conduct-ed at a high Reynolds number (Re≈4∙10^5). Mean velocity profiles and wall shear stresses are measured with hydraulic methods (Prandtl and Preston tubes). The results show that there is a lack of momentum at the outer wall of the diffuser and high shear stresses at the inner wall in case of the homogeneous inflow pro-file. For the typical fan outlet profile it can be shown that there is an opposite ef-fect with high wall shear stresses at the outer wall while the boundary layer of the inner wall lacks momentum. The pressure recovery of the Configuration is in good agreement with previous studies

Wurz Dieter - One of the best experts on this subject based on the ideXlab platform.

  • Experimental investigation of an annular diffuser for axial fans at different inflow profiles
    2017
    Co-Authors: Walter Johannes, Wurz Dieter, Hartig Stefan, Gabi Martin
    Abstract:

    Axial fans are used in power plants for fresh air supply and flue gas transport. A typical Configuration consists of an axial fan and annular diffuser which connects the fan to the following Piping. In order to achieve a high efficiency of the con-figuration, not only the components have to be optimized but also their interaction. The present study focuses on the diffuser of the Configuration. Experiments are performed on a diffuser-Piping Configuration to investigate the influence of the velocity profile at the fan outlet on the pressure recovery of the Configuration. Two different diffuser inlet profiles are generated, an undisturbed profile and a profile with the typical outlet characteristics of a fan. The latter is generated by the superposition of screens in the inlet zone. The tests are conducted at a high Reynolds number (Re ≈ 4∙105). Mean velocity profiles and wall shear stresses are measured with hydraulic methods (Prandtl and Preston tubes). The results show that there is a lack of momentum at the outer wall of the diffuser and high shear stresses at the inner wall in case of the undisturbed inflow profile. For the typical fan outlet profile it is vice versa. There are high wall shear stresses at the outer wall while the boundary layer of the inner wall lacks momentum. The pressure recovery of the undisturbed inflow Configuration is in good agreement with other studies

  • Experimental investigation of an annular diffuser for axial flow fan Configurations at different inflow profiles
    2017
    Co-Authors: Walter Johannes, Wurz Dieter, Hartig Stefan, Gabi Martin
    Abstract:

    Axial fans are used in power plants for fresh air supply and flue gas transport. A typical Configuration consists of an axial fan and annular diffuser which connects the fan to the following Piping. In order to achieve a high efficiency of the con-figuration not only the components have to be optimized but also their interac-tion. The present study focuses on the diffuser of the Configuration. Experiments are performed on a diffuser-Piping Configuration in order to investigate the influ-ence of the velocity profile of the fan outlet on the pressure recovery of the con-figuration. Two different diffuser inlet profiles are generated, a homogeneous profile and a profile with the typical outlet characteristics of a fan. The latter is generated by the superposition of screens in the inlet zone. The tests are conduct-ed at a high Reynolds number (Re≈4∙10^5). Mean velocity profiles and wall shear stresses are measured with hydraulic methods (Prandtl and Preston tubes). The results show that there is a lack of momentum at the outer wall of the diffuser and high shear stresses at the inner wall in case of the homogeneous inflow pro-file. For the typical fan outlet profile it can be shown that there is an opposite ef-fect with high wall shear stresses at the outer wall while the boundary layer of the inner wall lacks momentum. The pressure recovery of the Configuration is in good agreement with previous studies