EFFECT OF THE DROPLET SURFACE TENSION CORRECTION ON NUCLEATION CONDENSING WATER VAPOR FLOW

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REZAZADEH JAVAD; LAKZIAN ESMAIL; MAHPEYKAR MOHAMMAD REZA

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Journal: Modares Mechanical Engineering Year:2016 | Volume:16 | Issue:2 Page(s): 264-274

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Title

EFFECT OF THE DROPLET SURFACE TENSION CORRECTION ON NUCLEATION CONDENSING WATER VAPOR FLOW

Author(s)

REZAZADEH JAVAD | LAKZIAN ESMAIL | MAHPEYKAR MOHAMMAD REZA | Issue Writer Certificate

Keywords

CONDENSING STEAM FLOWQ1

SURFACE TENSION KALOVA CORRECTIONQ1

NUCLEATIONQ1

TOLMAN COEFFICIENTQ2

Abstract

Condensing flow in nozzle and stationary blades of steam turbine has been the subject of many studies.Due to the lack of precise relationship between surface tension and small droplet radius, the radial dependence of surface tension has been ignored in calculations and instead of droplet surface tension, surface tension of flat surface is used. Gibbs-Tolman-Koenig-Buff equation express the radial dependence of surface tension that Kalova provides as a relationship of changes in surface tension versus radius of the surface by fitting response from the exact solution of GTKB equation. The aforementioned relationship is known as Kalova surface tension equation. The present study considers the effect of the Kalova surface tension correction on NUCLEATION and droplet growth in condensing flows in an ultrasonic Laval nozzle. Since TOLMAN COEFFICIENT (d) is an important parameter in Kalova surface tension equation, by fitting response from Tolman equations a correlation for TOLMAN COEFFICIENT temperature changes is suggested for the first time. Kalova surface tension correction has a direct impact on the droplets crisis radius and droplets crisis free energy that the impact of both them in the modified classical NUCLEATION equation have been studied for the first time. The results of analytical modeling of one-dimensional adiabatic supersonic flow by applying the Kalova surface tension correction and using the proposed equation for TOLMAN COEFFICIENT temperature changes indicate an improvement to the 12% in radius of the droplets and 5% in pressure distribution in the region of condensation shock.

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APA: Copy

REZAZADEH, JAVAD, LAKZIAN, ESMAIL, & MAHPEYKAR, MOHAMMAD REZA. (2016). EFFECT OF THE DROPLET SURFACE TENSION CORRECTION ON NUCLEATION CONDENSING WATER VAPOR FLOW. MODARES MECHANICAL ENGINEERING, 16(2), 264-274. SID. https://sid.ir/paper/178842/en

Vancouver: Copy

REZAZADEH JAVAD, LAKZIAN ESMAIL, MAHPEYKAR MOHAMMAD REZA. EFFECT OF THE DROPLET SURFACE TENSION CORRECTION ON NUCLEATION CONDENSING WATER VAPOR FLOW. MODARES MECHANICAL ENGINEERING[Internet]. 2016;16(2):264-274. Available from: https://sid.ir/paper/178842/en

IEEE: Copy

JAVAD REZAZADEH, ESMAIL LAKZIAN, and MOHAMMAD REZA MAHPEYKAR, “EFFECT OF THE DROPLET SURFACE TENSION CORRECTION ON NUCLEATION CONDENSING WATER VAPOR FLOW,” MODARES MECHANICAL ENGINEERING, vol. 16, no. 2, pp. 264–274, 2016, [Online]. Available: https://sid.ir/paper/178842/en

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