TY - JOUR
T1 - Particle Scale Numerical Simulation on Momentum and Heat Transfer of Two Tandem Spheroids: An IB-LBM Study
AU - Ke , Chunhai
AU - Shu , Shi
AU - Zhang , Hao
AU - Yuan , Haizhuan
JO - Advances in Applied Mathematics and Mechanics
VL - 6
SP - 1497
EP - 1526
PY - 2018
DA - 2018/09
SN - 10
DO - http://doi.org/10.4208/aamm.OA-2018-0005
UR - https://global-sci.org/intro/article_detail/aamm/12720.html
KW - Drag coefficient, average Nusselt number, IB-LBM, spheroids, inter particle distance, relative incidence angle.
AB - <p style="text-align: justify;">The cold fluid flowing over two hot spheroids placed in a tandem arrangement
was numerically studied via a GPU-based immersed boundary-lattice Boltzmann
method (IB-LBM) model. The drag coefficient and average Nusselt number of
both the two spheroids were obtained with the main influencing factors investigated.
To validate the IB-LBM model, several numerical case studies containing one and two
spheres were firstly conducted to reach the good agreement with the previously reported
data. Then, a number of simulations were further carried out which were designed
by changing the particle aspect ratio (1.0≤ $Ar$ ≤4.0) and inter particle distance
(1.5≤ $l$ ≤7.0, where $l = L/D$, $D$ stands for the volume-equivalent sphere diameter) as
well as the Reynolds number (10 ≤ $Re$ ≤200). Their influence on the momentum and
heat transfer characteristics between the solid and fluid phases were fully discussed.
Numerical results show that, for all the considered Reynolds numbers and aspect ratios,
the individual and total drag coefficients and average Nusselt number increase
with the inter particle distance. The inter particle distance has greater influence on the
drag coefficient and average Nusselt number of the trailing particle than the leading
one. The drag coefficient and average Nusselt number of the trailing particle are far
less than the leading one under the same working conditions. The prediction correlations
for the drag coefficient and average Nusselt number of both the two spheroids
were established with low deviations. At last, the influence of the relative incidence
angles between the two tandem spheroids on the momentum and heat transfer was
studied. It is shown that the relative incidence angles play significant roles due to the
change of the frontal area of the leading spheroid with these angles.</p>