Investigation of flow pattern, thermohydraulic performance and heat transfer improvement in 3D corrugated circular pipe under varying structure configuration parameters with development different correlations

2021 ◽  
Vol 126 ◽  
pp. 105394
Author(s):  
Ahmed Ramadhan Al-Obaidi ◽  
Jassim Alhamid
Keyword(s):  
Heat Transfer ◽  
Flow Pattern ◽  
Circular Pipe ◽  
Heat Transfer Improvement ◽  
Structure Configuration

Effect of rib arrangements on the flow pattern and heat transfer in internally ribbed rectangular divergent channels

2020 ◽  
Author(s):  
K. Sivakumar ◽  
T. Sampath Kumar ◽  
S. Sivasankar ◽  
V. Ranjithkumar ◽  
A. Ponshanmugakumar
Keyword(s):  
Heat Transfer ◽  
Flow Pattern

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.

scholarly journals Heat Transfer in an Open Thermosyphon : 1st Report, Observations of Flow Pattern

1962 ◽  
Vol 28 (192) ◽  
pp. 930-939 ◽  
Author(s):  
Shu HASEGAWA ◽  
Kiyoshi YAMAGATA ◽  
Kaneyasu NISHIKAWA
Keyword(s):  
Heat Transfer ◽  
Flow Pattern
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