Microflow leakage through the clearance of a metal-metal seal

Research output: Contribution to conferencePaper

Abstract

The motivation behind this study is to simulate high pressure gas flow through the clearance between a valve seat and disc when in a closed position using a representative model. This leakage phenomenon is common in metal-to-metal seal pressure relief valves. As a pressure relief valve reaches the set pressure, it is known for the leakage to increase. The representative model that we studied is of an ideal-gas flow through a 2D micro-channel in the slip flow regime. We used a laminar continuum flow solver which solved the mass, momentum and energy equations. In addition, we applied low pressure slip boundary conditions at the wall boundaries which considered Maxwell's model for slip. The channel height was varied from 1μm to 5μm while the length remained at 1.25 mm, this means the length to height ratio varied from 1250 to 250. Inlet pressure was varied from a low pressure (0.05 MPa) to a high pressure (18.6 MPa), while the outlet remained constant at atmospheric. The calculated mass flow rate is compared to an analytical solution giving very good agreement for low pressure ratios and high length to height ratios.

Conference

ConferenceASME Pressure Vessels & Piping Conference 2016
Abbreviated titleASME PVP
CountryCanada
CityVancouver
Period17/07/1621/07/16
Internet address

Fingerprint

Seals
Metals
Pressure relief valves
Flow of gases
Momentum
Flow rate
Boundary conditions

Keywords

  • metal-to-metal seal
  • pressure relief valve
  • leakage
  • microflow modelling

Cite this

Anwar, A. A., Ritos, K., Gorash, Y., Dempster, W., & Nash, D. (Accepted/In press). Microflow leakage through the clearance of a metal-metal seal. Paper presented at ASME Pressure Vessels & Piping Conference 2016, Vancouver, Canada.
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title = "Microflow leakage through the clearance of a metal-metal seal",
abstract = "The motivation behind this study is to simulate high pressure gas flow through the clearance between a valve seat and disc when in a closed position using a representative model. This leakage phenomenon is common in metal-to-metal seal pressure relief valves. As a pressure relief valve reaches the set pressure, it is known for the leakage to increase. The representative model that we studied is of an ideal-gas flow through a 2D micro-channel in the slip flow regime. We used a laminar continuum flow solver which solved the mass, momentum and energy equations. In addition, we applied low pressure slip boundary conditions at the wall boundaries which considered Maxwell's model for slip. The channel height was varied from 1μm to 5μm while the length remained at 1.25 mm, this means the length to height ratio varied from 1250 to 250. Inlet pressure was varied from a low pressure (0.05 MPa) to a high pressure (18.6 MPa), while the outlet remained constant at atmospheric. The calculated mass flow rate is compared to an analytical solution giving very good agreement for low pressure ratios and high length to height ratios.",
keywords = "metal-to-metal seal, pressure relief valve, leakage, microflow modelling",
author = "Anwar, {Ali A.} and Konstantinos Ritos and Yevgen Gorash and William Dempster and David Nash",
year = "2016",
month = "3",
day = "23",
language = "English",
note = "ASME Pressure Vessels & Piping Conference 2016, ASME PVP ; Conference date: 17-07-2016 Through 21-07-2016",
url = "https://www.asme.org/events/pvp",

}

Anwar, AA, Ritos, K, Gorash, Y, Dempster, W & Nash, D 2016, 'Microflow leakage through the clearance of a metal-metal seal' Paper presented at ASME Pressure Vessels & Piping Conference 2016, Vancouver, Canada, 17/07/16 - 21/07/16, .

Microflow leakage through the clearance of a metal-metal seal. / Anwar, Ali A.; Ritos, Konstantinos; Gorash, Yevgen; Dempster, William; Nash, David.

2016. Paper presented at ASME Pressure Vessels & Piping Conference 2016, Vancouver, Canada.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Microflow leakage through the clearance of a metal-metal seal

AU - Anwar, Ali A.

AU - Ritos, Konstantinos

AU - Gorash, Yevgen

AU - Dempster, William

AU - Nash, David

PY - 2016/3/23

Y1 - 2016/3/23

N2 - The motivation behind this study is to simulate high pressure gas flow through the clearance between a valve seat and disc when in a closed position using a representative model. This leakage phenomenon is common in metal-to-metal seal pressure relief valves. As a pressure relief valve reaches the set pressure, it is known for the leakage to increase. The representative model that we studied is of an ideal-gas flow through a 2D micro-channel in the slip flow regime. We used a laminar continuum flow solver which solved the mass, momentum and energy equations. In addition, we applied low pressure slip boundary conditions at the wall boundaries which considered Maxwell's model for slip. The channel height was varied from 1μm to 5μm while the length remained at 1.25 mm, this means the length to height ratio varied from 1250 to 250. Inlet pressure was varied from a low pressure (0.05 MPa) to a high pressure (18.6 MPa), while the outlet remained constant at atmospheric. The calculated mass flow rate is compared to an analytical solution giving very good agreement for low pressure ratios and high length to height ratios.

AB - The motivation behind this study is to simulate high pressure gas flow through the clearance between a valve seat and disc when in a closed position using a representative model. This leakage phenomenon is common in metal-to-metal seal pressure relief valves. As a pressure relief valve reaches the set pressure, it is known for the leakage to increase. The representative model that we studied is of an ideal-gas flow through a 2D micro-channel in the slip flow regime. We used a laminar continuum flow solver which solved the mass, momentum and energy equations. In addition, we applied low pressure slip boundary conditions at the wall boundaries which considered Maxwell's model for slip. The channel height was varied from 1μm to 5μm while the length remained at 1.25 mm, this means the length to height ratio varied from 1250 to 250. Inlet pressure was varied from a low pressure (0.05 MPa) to a high pressure (18.6 MPa), while the outlet remained constant at atmospheric. The calculated mass flow rate is compared to an analytical solution giving very good agreement for low pressure ratios and high length to height ratios.

KW - metal-to-metal seal

KW - pressure relief valve

KW - leakage

KW - microflow modelling

M3 - Paper

ER -

Anwar AA, Ritos K, Gorash Y, Dempster W, Nash D. Microflow leakage through the clearance of a metal-metal seal. 2016. Paper presented at ASME Pressure Vessels & Piping Conference 2016, Vancouver, Canada.