scholarly journals TWO-PHASE FLOW AND HEAT TRANSFER IN MULTIROD GEOMETRIES: SUBCHANNEL AND PRESSURE DROP MEASUREMENTS IN A NINE-ROD BUNDLE FOR DIABATIC AND ADIABATIC CONDITIONS.

1970 ◽  
Author(s):  
R.T. Jr. Lahey ◽  
B.S. Shiralkar ◽  
D.W. Radcliffe
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Adiabatic Conditions ◽  
Rod Bundle ◽  
Flow And Heat Transfer

A Multiobjective Parameter Study of Two-Phase Flow Channel Design

2020 ◽  
Author(s):  
Nicholas A. Evich ◽  
Nicholas R. Larimer ◽  
Mary I. Frecker ◽  
Matthew J. Rau
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Two Phase Flow ◽  
Circular Cross Section ◽  
Parameter Study ◽  
Phase Flow ◽  
Two Phase ◽  
Flow And Heat Transfer ◽  
High Heat Transfer ◽  
Manufacturing Techniques

Abstract Advanced manufacturing techniques have improved dramatically in recent years and design freedom for engineered components and systems has never been greater. Despite these advancements, the majority of our design tools for thermal-fluids systems are still rooted within traditional architectures and manufacturing techniques. In particular, the complex nature of two-phase flow and heat transfer has made the development of design methods that can accommodate these complex geometries enabled by new manufacturing techniques challenging. Here, we investigate a new design method for two-phase flow systems. We conduct a multiobjective parameter study considering two-phase flow and heat transfer through a single channel with a circular cross section. To increase our design degrees of freedom, we allow the channel to increase or decrease in cross-sectional area along its flow length, but constrain the channel inlet and outlet to a constant hydraulic diameter. Maximizing heat transfer and minimizing pressure drop are the two design objectives, which we evaluate using two-phase heat transfer correlations and the Homogeneous Equilibrium Model. We find that using small expansion angles can greatly reduce two-phase flow pressure drop and also provide high heat transfer coefficients when compared to straight channel designs. We present a set of feasible designs for varying input heat fluxes, liquid mass flow rates, and channel orientation angles and show how the ideal expansion channel angle varies with these operational conditions.

EFFECTS OF SYSTEM PARAMETERS ON THE TWO-PHASE FLOW AND HEAT TRANSFER BEHAVIOR IN A ROD BUNDLE

2019 ◽  
Author(s):  
Grant Garrett ◽  
Faith R. Beck ◽  
Yue Jin ◽  
Fan Bill Cheung ◽  
Stephen M. Bajorek ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
System Parameters ◽  
Rod Bundle ◽  
Flow And Heat Transfer ◽  
Heat Transfer Behavior ◽  
Transfer Behavior

Experimental and Numerical Studies of Pressure and Oscillatory Flow Effects on the Two-Phase Flow and Heat Transfer in a Rod Bundle

2022 ◽  
Vol 388 ◽  
pp. 111602
Author(s):  
Grant Garrett ◽  
Faith Beck ◽  
Douglas Miller ◽  
Brian Lowery ◽  
Fan-Bill Cheung ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Oscillatory Flow ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Rod Bundle ◽  
Flow And Heat Transfer ◽  
Numerical Studies ◽  
Flow Effects

Numerical Simulation of Gas-Liquid Two Phase Flow in the Annular Gap Scrubber

2006 ◽  
Author(s):  
Longjian Li ◽  
Wenzhi Cui ◽  
Qinghua Chen ◽  
Tien-Chien Jen ◽  
Quan Liao
Keyword(s):  
Heat Transfer ◽  
Blast Furnace ◽  
Pressure Drop ◽  
Two Phase Flow ◽  
Pressure Control ◽  
Phase Flow ◽  
Discrete Phase Model ◽  
Two Phase ◽  
Flow And Heat Transfer ◽  
Annular Gap

The pressure drop characteristics of the annular gap scrubber of the blast furnace gas are key elements for inner furnace pressure control. In the annular gap scrubber, there exists complicated interactions between three-dimensional compressible flow with two phase flow and heat transfer between gas and water particle. In the paper, the gas-liquid two-phase flow and heat transfer process in the annular gap scrubber are analyzed and the corresponding physical and mathematical models are proposed. The computational model is discretized with hybrid meshes into multi-block zones, and solved numerically by employing the Fluent solver. The motion of the water particles in the annular gap scrubber is simulated by the Lagrangian discrete phase model, meanwhile the interaction between two phases is taken into consideration. The numerical computations of the two-phase flow and heat transfer in the annular gap scrubber are performed under different mass flow rates, displacements of AGE (Annual Gap Element), and water-gas ratios. Based on the computed results under different conditions, the flow and pressure drop characteristics of the annular gap scrubber are illustrated and analyzed. The results can be used as the basis for the pressure control policy of the blast furnace.

Two-Phase Flow and Heat Transfer in Rectangular Micro-Channels

2003 ◽  
Author(s):  
Weilin Qu ◽  
Seok-Mann Yoon ◽  
Issam Mudawar
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Flow Pattern ◽  
Two Phase Flow ◽  
Flow Patterns ◽  
Heat Sinks ◽  
Phase Flow ◽  
Micro Channel ◽  
Two Phase ◽  
Micro Channels

Knowledge of flow pattern and flow pattern transitions is essential to the development of reliable predictive tools for pressure drop and heat transfer in two-phase micro-channel heat sinks. In the present study, experiments were conducted with adiabatic nitrogen-water two-phase flow in a rectangular micro-channel having a 0.406 × 2.032 mm cross-section. Superficial velocities of nitrogen and water ranged from 0.08 to 81.92 m/s and 0.04 to 10.24 m/s, respectively. Flow patterns were first identified using high-speed video imaging, and still photos were then taken for representative patterns. Results reveal that the dominant flow patterns are slug and annular, with bubbly flow occurring only occasionally; stratified and churn flow were never observed. A flow pattern map was constructed and compared with previous maps and predictions of flow pattern transition models. Annual flow is identified as the dominant flow pattern for conditions relevant to two-phase micro-channel heat sinks, and forms the basis for development of a theoretical model for both pressure drop and heat transfer in micro-channels. Features unique to two-phase micro-channel flow, such as laminar liquid and gas flows, smooth liquid-gas interface, and strong entrainment and deposition effects are incorporated into the model. The model shows good agreement with experimental data for water-cooled heat sinks.

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