Tag: PRESSURE DROP
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BK1-17 Improvements to HTRI 1D Kettle Circulation Model
October 18, 2022
This report discusses bundle pressure drop and recirculation flow rate measurements. Comparing HTRI data trends to the bundle flow rate measurements from the literature, we developed an improved circulation model for kettle reboilers. The improved model predicts a higher recirculation, especially at a high vapor generation, which also improves the thermal...
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BT-41 Pressure drop method for tubeside falling film evaporators
October 19, 2020
HTRI collected data for falling film evaporation in a vertical tube using five test fluids. This report discusses available pressure drop methods and correlations for intube falling film evaporators and investigates correlations for liquid film thickness and void fraction. The report also documents an improved pressure drop method based on the...
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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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FH-5 Fired Heater Research: Two-phase Flow in Vertical Serpentine Loop
November 03, 2017
Adiabatic air-water studies were completed in a transparent vertical serpentine loop with a 12.7-cm internal pipe diameter and six vertical upflow and downflow sections with straight lengths exceeding 6 m. Liquid holdup in the vertical runs tends to dominate the overall pressure drop. This study focuses on flow visualization and pressure...
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Pressure Drop and Flow Regime Map for Vertical Upflow in Piping
December 13, 2016
HTRI research focusing on large diameter pipes led to improved prediction of flow patterns and valuable guidance to operators. Author Siddharth Talapatra, Senior Project Engineer, Research Date December 11, 2016 Liquid-gas two-phase flow can be challenging for the oil and gas, process, and nuclear industries due to the fact that a...
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Raising the Bar for Accuracy
August 04, 2016
A more precise calibration method helps the RTC maintain the highest standard of data accuracy. Author Tiffany Burgess, Test Engineer Date August 1, 2016 Research Technician Becky Glover performs a calibration at the TSPU Arthur C. Nielsen, Jr. once said, “Watch every detail that affects the accuracy of your work.” At the...
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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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Research Update: Air-cooler Headers: Predicting Pressure Drop and Flow Distribution
January 16, 2017
Header flow maldistribution and pressure loss in air-cooled heat exchangers may significantly affect performance. Most relevant literature focuses on plate-fin and cylindrical channel headers for tubular heat exchangers. The flow in the header is affected by its internal geometry, the orientation of the nozzles on the header, and inlet flow velocity....
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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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CT-36 Horizontal Intube Condensation Heat Transfer and Pressure Drop of Propane
January 16, 2017
Under contract with HTRI, the Sustainable Thermal Systems Laboratory (STSL) at Georgia Institute of Technology is studying intube condensation with pentane, propane, and propane/ethane mixtures. In the second phase of the study, the STSL acquired condensation heat transfer and pressure drop data using propane as the working fluid. This report reviews...
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TE-6 Correlations for Heat Transfer and Pressure Drop of Tube Inserts in Single-phase Turbulent Swirl Flow
January 16, 2017
This report describes the mechanism behind turbulent swirl flow augmentation inside a tube, as well as the development of heat transfer and pressure drop correlations for Reynolds numbers between 3000 and 500000. The correlations have application independent of the specific swirl flow insert type. This report also identifies the lower bound...
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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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Condensation Heat Transfer and Pressure Drop Measurement for Pure Hydrocarbons and Mixtures in Plain Tubes
January 16, 2017
In 2011, Professor Srinivas Garimella, the Hightower Chair and Professor and Founder/Director of the Sustainable Thermal Systems Laboratory (STSL) at the Georgia Institute of Technology in Atlanta, Georgia, USA, began work on a 3-1/2 year contract with HTRI entitled Condensation Heat Transfer and Pressure Drop of Propane. This project will conclude...
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Research Update: Pressure Drop of Vacuum Condensation in a Vertical Tube
January 16, 2017
This webinar discusses the status of HTRI vacuum condensation research plans, describes the current methods in Xchanger Suite®, and proposes a method to be implemented in future versions of Xchanger Suite....
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CT-33 Horizontal Intube Condensation at Georgia Tech: Test Rig and Initial n-Pentane Data
January 16, 2017
Under contract with HTRI, the Sustainable Thermal Systems Laboratory (STSL) at Georgia Institute of Technology is studying intube condensation with pentane, propane, and propane/ethane mixtures. The STSL is conducting experiments in the Phase-Change Heat Transfer Test Facility, a closed loop, single-pressure system. In the first phase of the study, the STSL...
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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: Single-Phase Crossflow Methods
January 16, 2017
HTRI continues to improve its single-phase crossflow methods. We have completed a thorough review of heat transfer and pressure drop correlations for single-phase flow outside banks of plain- and low-finned tubes. This webinar highlights some of our findings and summarizes the performance of the improvements we are proposing for our correlations....
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TechTip: Customized Heat Transfer and Pressure Drop Calculations in Xchanger Suite
January 16, 2017
Xchanger Suite® provides sophisticated modeling capabilities for a wide range of heat exchangers. Occasionally, you may need to customize the software to extend its capabilities. In this webinar, we discuss the reasons for using non-standard solutions and explore the range of customization options available. Additionally, using an example case, we review and...
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TT-6 Handling excessive pressure drop for low-pressure condensers
September 28, 2026
Modeling low-pressure and vacuum condensers can be challenging because the pressure profile has a large impact on the thermal performance. This TechTip discusses how you can use models in different software versions....
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