The Experts below are selected from a list of 117 Experts worldwide ranked by ideXlab platform

Zhaogao Luan - One of the best experts on this subject based on the ideXlab platform.

  • heat transfer correlations for laminar flows within a mechanical Seal Chamber
    Tribology International, 2009
    Co-Authors: Zhaogao Luan, M M Khonsari
    Abstract:

    Abstract Numerical investigation of conjugate heat transfer associated with laminar flow within the Chamber of a mechanical Seal is presented. It involves simultaneous solution of the Navier–Stokes and energy equations. The computational model takes into account the temperature distribution within the rotating and stationary rings. A series of simulation results are presented for predicting the performance of a mechanical Seal assuming that the flow in the Seal Chamber remains laminar. Expressions are developed for predicting the convective heat transfer coefficient on the outer surfaces of the Seal rings exposed to the process fluid in the Seal Chamber.

  • Analysis of conjugate heat transfer and turbulent flow in mechanical Seals
    Tribology International, 2009
    Co-Authors: Zhaogao Luan, Michael M. Khonsari
    Abstract:

    A numerical investigation of conjugate heat transfer of turbulent flow within a mechanical Seal Chamber is presented. The computational model takes into account the heat generation at the contact interface between the rotating ring and the stationary ring, heat conduction into the rings, and heat convection into the surrounding fluid in the Chamber. Correlations are developed for predicting the average heat transfer coefficient on the wetted outer surfaces of the Seal rings assuming that the flow in the Seal Chamber is turbulent.

  • computational fluid dynamics analysis of turbulent flow within a mechanical Seal Chamber
    Journal of Tribology-transactions of The Asme, 2007
    Co-Authors: Zhaogao Luan, M M Khonsari
    Abstract:

    Turbulent flow inside the Seal Chamber of a pump operating at high Reynolds number is investigated. The K-e turbulence model posed in cylindrical coordinates was applied for this purpose. Simulations are performed using the fractional approach method. The results of the computer code are verified by using the FLUENT and by comparing to published results for turbulent Taylor Couette flow. Numerical results of four cases including two rotational speeds with four flush rates are reported. Significant difference between the laminar and the turbulence flow in the Seal Chamber is predicted. The behavior of the turbulent flows with very high Reynolds number was also investigated. The physical and practical implications of the results are discussed.

  • Numerical Simulations of the Flow Field Around the Rings of Mechanical Seals
    Journal of Tribology, 2006
    Co-Authors: Zhaogao Luan, Michael M. Khonsari
    Abstract:

    The flow inside a Seal Chamber as induced by the influx of the flush fluid and the rotation of the primary ring is analyzed. The 3-D flow characteristic around the mating ring and the rotating ring are predicted by solving the Navier-Stokes equations in cylindrical coordinates. For this purpose, the pressure correction method was used in conjunction with the SIMPLE algorithm. A series of numerical solutions is presented that show the flow mechanism within the gap between the rings and the gland. The implication of the flow characteristic on the cooling of the rings is discussed.

Michael M. Khonsari - One of the best experts on this subject based on the ideXlab platform.

  • Analysis of conjugate heat transfer and turbulent flow in mechanical Seals
    Tribology International, 2009
    Co-Authors: Zhaogao Luan, Michael M. Khonsari
    Abstract:

    A numerical investigation of conjugate heat transfer of turbulent flow within a mechanical Seal Chamber is presented. The computational model takes into account the heat generation at the contact interface between the rotating ring and the stationary ring, heat conduction into the rings, and heat convection into the surrounding fluid in the Chamber. Correlations are developed for predicting the average heat transfer coefficient on the wetted outer surfaces of the Seal rings assuming that the flow in the Seal Chamber is turbulent.

  • Numerical Simulations of the Flow Field Around the Rings of Mechanical Seals
    Journal of Tribology, 2006
    Co-Authors: Zhaogao Luan, Michael M. Khonsari
    Abstract:

    The flow inside a Seal Chamber as induced by the influx of the flush fluid and the rotation of the primary ring is analyzed. The 3-D flow characteristic around the mating ring and the rotating ring are predicted by solving the Navier-Stokes equations in cylindrical coordinates. For this purpose, the pressure correction method was used in conjunction with the SIMPLE algorithm. A series of numerical solutions is presented that show the flow mechanism within the gap between the rings and the gland. The implication of the flow characteristic on the cooling of the rings is discussed.

M M Khonsari - One of the best experts on this subject based on the ideXlab platform.

  • heat transfer correlations for laminar flows within a mechanical Seal Chamber
    Tribology International, 2009
    Co-Authors: Zhaogao Luan, M M Khonsari
    Abstract:

    Abstract Numerical investigation of conjugate heat transfer associated with laminar flow within the Chamber of a mechanical Seal is presented. It involves simultaneous solution of the Navier–Stokes and energy equations. The computational model takes into account the temperature distribution within the rotating and stationary rings. A series of simulation results are presented for predicting the performance of a mechanical Seal assuming that the flow in the Seal Chamber remains laminar. Expressions are developed for predicting the convective heat transfer coefficient on the outer surfaces of the Seal rings exposed to the process fluid in the Seal Chamber.

  • computational fluid dynamics analysis of turbulent flow within a mechanical Seal Chamber
    Journal of Tribology-transactions of The Asme, 2007
    Co-Authors: Zhaogao Luan, M M Khonsari
    Abstract:

    Turbulent flow inside the Seal Chamber of a pump operating at high Reynolds number is investigated. The K-e turbulence model posed in cylindrical coordinates was applied for this purpose. Simulations are performed using the fractional approach method. The results of the computer code are verified by using the FLUENT and by comparing to published results for turbulent Taylor Couette flow. Numerical results of four cases including two rotational speeds with four flush rates are reported. Significant difference between the laminar and the turbulence flow in the Seal Chamber is predicted. The behavior of the turbulent flows with very high Reynolds number was also investigated. The physical and practical implications of the results are discussed.

John Griffith - One of the best experts on this subject based on the ideXlab platform.

  • multistage pump efficiency gains through the elimination of the Seal Chamber pressure equalization line
    2004
    Co-Authors: Trey Maxwell, John Griffith
    Abstract:

    The majority of horizontally split multistage pumps were designed when packing was the only cost effective method of Sealing the pumpage from atmosphere. As a result, even modern pumps employ a stuffing box pressure equalization line (balance line) to lower stuffing box pressures. This technique of pressure equalization has a major drawback: reduced pump efficiency. The work that is done on the fluid that is throttled back to suction through the balance line is lost and acts to reduce the useful work done by the pump. While this was an acceptable compromise in the 1950s, it is now a true waste of very expensive electrical power. The modern solution to this problem is to eliminate the balance line and apply a correctly specified mechanical Seal to the high pressure side of the pump. This paper serves to show that, with careful consideration of the effects of balance line removal, pump life can be maintained and efficiency gains achieved.

Griffith John - One of the best experts on this subject based on the ideXlab platform.

  • Multistage Pump Efficiency Gains Through The Elimination Of The Seal Chamber Pressure Equalization Line
    Texas A&M University. Turbomachinery Laboratories, 2004
    Co-Authors: Maxwell Trey, Griffith John
    Abstract:

    Lecturepg. 88The majority of horizontally split multistage pumps were designed when packing was the only cost effective method of Sealing the pumpage from atmosphere. As a result, even modern pumps employ a stuffing box pressure equalization line (balance line) to lower stuffing box pressures. This technique of pressure equalization has a major drawback: reduced pump efficiency. The work that is done on the fluid that is throttled back to suction through the balance line is lost and acts to reduce the useful work done by the pump. While this was an acceptable compromise in the 1950s, it is now a true waste of very expensive electrical power. The modern solution to this problem is to eliminate the balance line and apply a correctly specified mechanical Seal to the high pressure side of the pump. This paper serves to show that, with careful consideration of the effects of balance line removal, pump life can be maintained and efficiency gained