Category: TWO-PHASE FLOW
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Research Update: Modeling Flow Distribution in Manifolds and Headers
January 15, 2017
In this webinar, we will discuss flow distribution and pressure drop for single T-junctions and manifolds by describing the T-junction resistance coefficients and how they vary with flow conditions and geometry describing manifold geometry and outlining the differential and discrete equation approaches for solving the flow distribution problem demonstrating which approach...
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Research Update: Pressure Drop in Inclined Intube Downflow Condensation
January 16, 2017
Based on recent research, HTRI has developed a new pressure drop method for inclined cocurrent condensation. In this webinar, we discuss the effect of tube inclination on two-phase flow regimes and pressure drop. The performance of the existing inclined condensation pressure drop method is assessed against data, and an improved pressure...
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Research Update: Two-phase Pressure Drop across Changes in Cross-sectional Area
January 16, 2017
In this webinar, we describe pressure drop correlations and provide recommendations for their use. Many flow circuits include pipe diameter variations and piping components such as orifice plates, contractions, and expansions. Accurate prediction of the single- and two-phase pressure drops across these components is necessary to calculate the total pressure drop...
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TPF-16 Flow Regime, Void Fraction, and Pressure Drop for Adiabatic Vertical Downflow
March 06, 2017
Adiabatic air-water studies were performed in a large pipe with vertical downflow, using a section of the HTRI air-water flow loop. High-speed videos of the downflow were analyzed to estimate the void fraction and to obtain a flow regime map. A falling film annular flow regime was observed for most flow...
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TPG-7 Challenges of Simulating Complete Intube Phase Change with CFD
March 13, 2017
Over the past several decades, the accuracy and usability of computational methods have substantially improved. This report reviews the complicated physics of two-phase flow and phase change, presents the equations of motion for a two-phase flow with various closure models, and compares current computational approaches. Although inadequate for the entire spectrum of...
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Research Update: Two-phase Flow Research - Key Findings and Impact
April 13, 2017
HTRI recently concluded research in the following topics: Vertical Upflow – pressure drop and void fraction Vertical Upflow – flow regime map Vertical Downflow – pressure drop and void fraction Vertical Downflow – flow regime The details of the research, results, and discussions have been published in HTRI research reports TPF-14,...
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Educational: Introduction to Two-phase Flow
December 04, 2018
Boiling, condensation, and multi-phase flows exist in many heat exchanger applications. This webinar describes the basic ideas used in heat transfer and pressure drop calculations of two-phase flow. It discusses theoretical and empirical models, a flow regime-based approach, and an overview of experimental research in the field....
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