Numerical Investigation on Heat Transfer and Fluid Flow Characteristics of Natural Circulation Loop with Parallel Channels

2018 ◽  
pp. 367-374
Author(s):  
Ramesh Babu Bejjam ◽  
K. Kiran Kumar
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Numerical Investigation ◽  
Natural Circulation ◽  
Flow Characteristics ◽  
Circulation Loop ◽  
Natural Circulation Loop ◽  
Parallel Channels ◽  
Fluid Flow Characteristics

Numerical investigation of heat transfer and fluid flow characteristics inside a wavy channel

2006 ◽  
Vol 43 (7) ◽  
pp. 603-611 ◽  
Author(s):  
Gong-Nan Xie ◽  
Qiu-Wang Wang ◽  
Min Zeng ◽  
Lai-Qin Luo
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Numerical Investigation ◽  
Flow Characteristics ◽  
Wavy Channel ◽  
Fluid Flow Characteristics

Numerical investigation of heat transfer and fluid flow characteristics inside tube with internally star fins

2018 ◽  
Vol 55 (7) ◽  
pp. 1901-1911 ◽  
Author(s):  
Fahimeh Khanmohammadi ◽  
Mousa Farhadi ◽  
A. Ali Rabienataj Darzi
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Numerical Investigation ◽  
Flow Characteristics ◽  
Fluid Flow Characteristics

A223 Heat Transfer and Flow Characteristics during Reflooding Process in Natural Circulation Loop

2014 ◽  
Vol 2014 (0) ◽  
pp. _A223-1_-_A223-2_
Author(s):  
Takuya Kawai ◽  
Ikki Yumoto ◽  
Takeyuki Ami ◽  
Hisashi Umekawa ◽  
Mamoru Ozawa
Keyword(s):  
Heat Transfer ◽  
Natural Circulation ◽  
Flow Characteristics ◽  
Circulation Loop ◽  
Natural Circulation Loop

scholarly journals Numerical investigation of heat transfer and fluid flow characteristics inside a wavy channel

2007 ◽  
Vol 43 (7) ◽  
pp. 721-721
Author(s):  
Gong-Nan Xie ◽  
Qiu-Wang Wang ◽  
Min Zeng ◽  
Lai-Qin Luo
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Numerical Investigation ◽  
Flow Characteristics ◽  
Wavy Channel ◽  
Fluid Flow Characteristics

Numerical Investigation of Heat Transfer and Fluid Flow Characteristics in Circular Wavy Microchannels with Sidewall Rib

2020 ◽  
Vol 15 (2) ◽  
Author(s):  
Ranjith Kumar Valaparla ◽  
Karthik Balasubramanian ◽  
Kupireddy Kiran Kumar
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Pressure Drop ◽  
Thermal Resistance ◽  
Numerical Investigation ◽  
Heat Sink ◽  
Flow Characteristics ◽  
Computational Domain ◽  
Hexahedral Elements ◽  
Fluid Flow Characteristics

AbstractPurpose: Numerical investigation was carried out to study the hydro-thermal characteristics in circular wavy microchannels (CWMCs) with sidewall rib. Thermal resistance and pressure drop penalty were compared with sinusoidal wavy microchannels (SWMCs) design. Parametric study on sidewall rib was also carried to minimize the pressure drop penalty and to achieve lower thermal resistance. Introducing sidewall rib in the CWMCs leads to the formation of more Deans vortices. This leads to an effective fluid mixing and augments the convective heat transfer. Design methodology/approach: A computational solid domain was created in SOLIDWORKS and the fluid domain was produced by circular arc profile for the entire length of heat sink. 3-D numerical investigation was carried out using ANSYS FLUENT software. Created computational domain was imported into ANSYS WORKBENCH. Meshing was executed in ANSYS mesh module. The computational domains were meshed using hexahedral elements adopting match control on both sides of microchannel (MC). The numerical investigation was carried out in the Re range from 100 to 300 with constant heat flux (50 W/cm2) applied at the bottom of the channel. Heat transfer and fluid flow characteristics were explained with velocity vectors, velocity contours and temperature contours. Findings: From numerical studies, it is concluded that CWMC with sidewall rib width (0.15 mm) leads to 33.6 % lower thermal resistance than SWMC with pressure drop penalty. Originality/Value: Present study is useful to identify the optimum deign to augment the heat dissipation performance of microchannel heat sink.

Two Dimensional Simulation of Heat Transfer and Fluid Flow in a Rectangular Natural Circulation Loop Containing PCM Suspensions

2004 ◽  
Author(s):  
C. J. Ho ◽  
S. Y. Chiu ◽  
J. F. Lin
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Liquid Phase ◽  
Phase Change ◽  
Natural Circulation ◽  
Circulation Loop ◽  
Freezing Process ◽  
Two Dimensional ◽  
Natural Circulation Loop ◽  
Solid Liquid

A two-dimensional numerical simulation, via a finite difference method, of fluid flow and heat transfer in a rectangular natural circulation loop is presented to explore efficacy of using solid-liquid phase change material (PCM) suspensions as a heat transfer medium. A continuum mixture flow model is used for the buoyancy-driven circulation flow of the PCM suspensions together with an approximate enthalpy model to describe the solid-liquid phase change (melting/freezing) process of the PCM particles in the loop. Parametric simulations have been conducted for the pertinent physical parameters of a loop with fixed geometrical configuration in the following ranges: the modified Rayleigh number Ra* = 109 ∼ 1013, the modified Stefan number Ste* = 0.05 ∼ 0.5, the particle volumetric fraction cv = 0 ∼ 20%, and the modified subcooling factor Sb* = 0∼2.0. The melting/freezing processes of the PCM particles at the heated/cooled sections of the loop are closely interrelated in their inlet conditions of the suspension. Closer examination of numerical results reveals that there could be a flow regime in the parametric domain where heat transfer performance of the suspension circulation loop is significantly enhanced, due to contribution of the latent heat transport associated with melting/freezing of PCM particles.

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