PTV experiments of subcooled boiling flow through a vertical rectangular channel

2010 ◽  
Vol 36 (9) ◽  
pp. 691-706 ◽  
Author(s):  
C.E. Estrada-Perez ◽  
Y.A. Hassan
Keyword(s):  
Rectangular Channel ◽  
Subcooled Boiling ◽  
Boiling Flow ◽  
Flow Through

PTV Experiments of Subcooled Boiling Flow Through a Rectangular Channel

2008 ◽  
Author(s):  
Carlos E. Estrada-Perez ◽  
Elvis E. Dominguez-Ontiveros ◽  
Hee Seok Ahn ◽  
Noushin Amini ◽  
Yassin A. Hassan
Keyword(s):  
Turbulence Modeling ◽  
Rectangular Channel ◽  
Reynolds Numbers ◽  
Heat Fluxes ◽  
Heated Wall ◽  
Reynolds Stresses ◽  
Subcooled Boiling ◽  
Square Channel ◽  
Boiling Flow ◽  
Visualization Techniques

Experiments were carried out to investigate turbulent sub-cooled boiling flow of Novec-2000 [1] refrigerant through a vertical square channel with one heated wall. Channel dimensions were selected to be similar to those encountered on a Boiling Water Reactor (BWR) channel flow, with an hydraulic diameter of Dh = 8.2mm. Flow visualization techniques such as Particle Tracking Velocimetry (PTV) and Shadowgraphy were used to measure time-average axial and normal velocities, axial and normal turbulence intensities, and Reynolds Stresses. Results are reported for hydraulic Reynolds numbers at channel inlet of 4638, 14513 and 24188 for up to thirteen wall heat fluxes (q″) ranging from 0.0 to 64.0 kW/m2. This work is an attempt to enrich the database already collected on turbulent subcooled boiling flow, with the hope that it will be useful in turbulence modeling efforts.

scholarly journals Study of Mini Channel Heat Sink with Different Internal Configuration

2020 ◽  
Vol 319 ◽  
pp. 02004
Author(s):  
Muhammad Akif Rahman ◽  
Md Badrath Tamam ◽  
Md Sadman Faruque ◽  
A.K.M. Monjur Morshed
Keyword(s):  
Nusselt Number ◽  
Thermal Performance ◽  
Heat Sink ◽  
Rectangular Channel ◽  
Three Dimensional ◽  
Heat Sinks ◽  
Maximum Temperature ◽  
Rectangular Channels ◽  
Flow Through ◽  
Internal Configuration

In this paper a numerical analysis of three-dimensional laminar flow through rectangular channel heat sinks of different geometric configuration is presented and a comparison of thermal performance among the heat sinks is discussed. Liquid water was used as coolant in the aluminum made heat sink with a glass cover above it. The aspect ratio (section height to width) of rectangular channels of the mini-channel heat sink was 0.33. A heat flux of 20 W/cm2 was continuously applied at the bottom of the channel with different inlet velocity for Reynold’s number ranging from 150 to 1044. Interconnectors and obstacles at different positions and numbers inside the channel were introduced in order to enhance the thermal performance. These modifications cause secondary flow between the parallel channels and the obstacles disrupt the boundary layer formation of the flow inside the channel which leads to the increase in heat transfer rate. Finally, Nusselt number, overall thermal resistance and maximum temperature of the heat sink were calculated to compare the performances of the modified heat sinks with the conventional mini channel heat sink and it was observed that the heat sink with both interconnectors and obstacles enhanced the thermal performance more significantly than other configurations. A maximum of 36% increase in Nusselt number was observed (for Re =1044).

Modeling of low-pressure subcooled boiling flow of water via the homogeneous MUSIG approach

2009 ◽  
Vol 239 (10) ◽  
pp. 1733-1743 ◽  
Author(s):  
Erfeng Chen ◽  
Yanzhong Li ◽  
Xianghua Cheng ◽  
Lei Wang
Keyword(s):  
Low Pressure ◽  
Subcooled Boiling ◽  
Boiling Flow

scholarly journals Area of bubble influence due to sliding bubbles in subcooled boiling flow

2018 ◽  
Vol 125 ◽  
pp. 43-52 ◽  
Author(s):  
Junsoo Yoo ◽  
Carlos E. Estrada-Perez ◽  
Yassin A. Hassan
Keyword(s):  
Subcooled Boiling ◽  
Boiling Flow ◽  
Sliding Bubbles
Sign in / Sign up

Export Citation Format

Share Document