Abstract
Phase-change materials (PCMs) combine the latent and sensible heat adsorption capabilities which makes them promising candidates in a wide range of heat transfer applications such as battery thermal management systems (BTMSs) in hybrid electric vehicles (HEVs), battery electric vehicles (BEVs) and fuel cell electric vehicles (FCEVs). PCM must preserve the battery cells in the desired temperature range. However, pure PCMs face some challenges due to their low thermal conductivities. To mitigate this issue, one possible solution is employing fins to enhance the heat transfer across the PCM. Since the PCM melting is affected by buoyancy forces, alignment of employed fins may have an essential role in the performance of BTMSs. In the current investigation, six different BTMSs using PCM with dissimilar fin alignments are simulated and evaluated. The time evolution of liquid fraction contours are depicted for simulated cases. The results indicate that the BTMS employing horizontal fins provides the best cooling effect with the largest melt fraction after a prescribed period of time. Besides, the results demonstrate that the breaking manner of solid PCM can be greatly affected by the alignment of fins.
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Abbreviations
- C :
-
Mushy zone number in Eq. (4) (kg/(m3.s))
- g :
-
Gravitational acceleration (m/s2)
- G b :
-
Turbulence kinetic energy generation by buoyancy forces (kg/(m.s3))
- G k :
-
Turbulence kinetic energy generation caused by mean velocity gradients (kg/(m.s3))
- h :
-
Specific enthalpy (J/kg)
- k :
-
Thermal conductivity (W/(m.K))
- L :
-
Latent heat for phase change material (J/kg)
- \( {\dot{m}}_{pq} \) :
-
Mass transfer rate from phase p to phase q (kg/s)
- \( {\dot{m}}_{qp} \) :
-
Mass transfer from phase q to phase p (kg/s)
- p :
-
Pressure (Pa)
- S :
-
Source term
- t :
-
Time (s)
- T :
-
Temperature (K)
- u i :
-
ith component of velocity vector (m/s)
- \( \overrightarrow{V} \) :
-
Velocity vector (m/s)
- α :
-
Volume fraction
- γ :
-
Liquid fraction
- μ :
-
Dynamic viscosity (kg/(m.s))
- ρ :
-
Density (kg/m3)
- b :
-
Buoyancy
- eff :
-
Effective
- L :
-
Liquidus
- ref :
-
Reference value
- s :
-
Solidus / Sensible
- BEV:
-
Battery electric vehicle
- BTMS:
-
Battery thermal management system
- CENG:
-
Compressed extended natural graphite
- FCEV:
-
Fuel cell electric vehicle
- HEV:
-
Hybrid electric vehicle
- PCM:
-
Phase change material
- RNG:
-
Renormalized group
- VOF:
-
Volume of fluid
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Shojaeefard, M.H., Molaeimanesh, G.R. & Ranjbaran, Y.S. Improving the performance of a passive battery thermal management system based on PCM using lateral fins. Heat Mass Transfer 55, 1753–1767 (2019). https://doi.org/10.1007/s00231-018-02555-0
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DOI: https://doi.org/10.1007/s00231-018-02555-0