Tag: TWO-PHASE FLOW

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Two-phase flow in air-cooled heat exchangers

June 10, 2020

Brandon White, Test Engineer Air-cooled heat exchangers are one of the most widely used types of heat exchangers. At times, they can experience two-phase flow separation and flow maldistribution inside their header boxes, potentially reducing process heat transfer. At HTRI’s Research & Technology Center, we are currently working on a project...
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• AIR-COOLED HEAT EXCHANGER
• XACE
• TWO-PHASE FLOW

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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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• HEAT TRANSFER
• PRESSURE DROP
• TWO-PHASE FLOW

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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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• FLOW REGIME
• PRESSURE DROP
• REPORT
• RESEARCH
• TWO-PHASE 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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• CFD
• TWO-PHASE FLOW
• BOILING
• CONDENSATION
• FLOW REGIME

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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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• FLOW REGIME
• TWO-PHASE FLOW

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Research Update: Modeling Flow Distribution in Manifolds and Headers

January 16, 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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• FLOW DISTRIBUTION
• PHE HEADER
• PLATE HEAT EXCHANGER
• PRESSURE DROP
• RESEARCH
• TWO-PHASE FLOW

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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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• PRESSURE DROP
• RESEARCH
• TWO-PHASE FLOW

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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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• CONDENSATION
• INCLINED INTUBE
• PRESSURE DROP
• RESEARCH
• TWO-PHASE FLOW

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CT-27 CFD Modeling of Intube Condensation

January 16, 2017

After briefly surveying the challenges of modeling condensation with computational fluid dynamics (CFD), we apply two relevant two-phase models in ANSYS® FLUENT® with varying degrees of success. Homogeneous nucleation in a Laval nozzle is well predicted, while the more interesting and relevant intube film condensation is plagued by grid resolution, model...
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• TWO-PHASE FLOW
• CONDENSATION
• CFD

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BK1-11 Two-Dimensional CFD Simulations of Kettle Reboilers

January 16, 2017

To gain further insight into kettle reboiler operation and improve Xist® models, we simulated several kettle reboilers in two dimensions using CFD. The two-phase simulation results show good agreement with pressure drop and vapor volume fraction measurements from the literature. However, recirculation ratios calculated from the CFD results are substantially greater...
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• TWO-PHASE FLOW
• KETTLE REBOILER
• CFD

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