Heat transfer in complex geometries

coil

Coiled tubes have been widely used in process industries due to their compactness, higher heat and mass transfer rate, and ease of manufacture. They are commonly used as heat exchanger and/or chemical reactors with diverse applications ranging from automotive, aerospace, power plants and so forth. Aside from their industrial applications, transport phenomena in coiled tubes have attracted many attention from researcher. The secondary flow development induced by coil curvature and complex temperature and mass transfer profiles are among significant phenomena. Our group focuses on investigating fundamental flow behaviour as well as heat and mass transfer performance at both global as well as local level in order to get better understanding which later will be used to improve and optimize the design.

Relevant publications:

  1. J.C. Kurnia, A.P. Sasmito*, S.V. Jangam, A.S. Mujumdar, Heat Transfer in Coiled Square Tubes for Laminar Flow of a Slurry of Microencapsulated Phase Change Material (MEPCM), Heat Transfer Engineering 2013;34:994-1007.
  2. A.P. Sasmito*, J.C. Kurnia, S.V. Jangam, W. Wang, A.S. Mujumdar, Numerical Analysis of Laminar Heat Transfer Performance of In-plane Spiral Ducts with Various Cross Sections at Fixed Cross Section Area, International Journal of Heat and Mass Transfer 2012;55:5882-5890.
  3. J.C. Kurnia, A.P. Sasmito, A.S. Mujumdar*, Laminar Convective Heat Transfer for In-plane Spiral Coils of Non-circular Cross Sections Ducts: A Computational Fluid Dynamics Study, Thermal Science 2012;16:107-116.
  4. J.C. Kurnia, A.P. Sasmito*, A.S. Mujumdar, Numerical Investigation of Laminar Heat Transfer Performance of Various Cooling Channel Designs,  Applied Thermal Engineering 2011;31:1293-1304.
  5. J.C. Kurnia, A.P. Sasmito, A.S. Mujumdar*, Evaluation of Heat Transfer Performance of Helical Coils of Non-circular Tubes, Journal of Zhejiang University Science: A 2011;12:63-70.

Nanofluids and micro-encapsulated phase change materials

nanofluids

It is well known that conventional heat transfer fluids including water, oil, and ethylene glycol mixtures have poor heat transfer rate due to their low thermal conductivity. Therefore, over the past decade, extensive research have been conducted to improve thermal conductivity of these fluids by suspending nanoparticles of diverse materials in heat transfer fluids, called nanofluids. Modern technology provides opportunities to process and produce particles below 50 nm. It is also expected that nanofluids should provide not only higher heat transfer rate, but also good stability of the suspension by eliminating possible agglomeration and sedimentation to permit long-term application. Our group focuses on developing mathematical model to ensure accurate heat transfer prediction of nanofluids. The model ranging from single phase homogeneous model, to complex two-phase model or Eulerian, mixture as well as Euler-Lagrange model. Thermal cycling as well as stability enhancement is considered as well.

Relevant publications

  1. A.P. Sasmito, J.C. Kurnia*, A.S. Mujumdar, Numerical Evaluation of Laminar Heat Transfer Enhancement in Nanofluid Flow in Coiled Square Tubes, Nanoscale Research Letters,  Vol 6: 376, 2011,
  2. A.P. Sasmito, S.A. Khan, A.S. Mujumdar, Nanofluids Heat Transfer: Preparation, Characterization and Theoretical Aspects, book chapter in: Nanofluids: Research, Development and Applications, edited by Y. Zhang, Nova Science Publishers, Inc., Hauppauge, NY, 2013, ISBN: 978-1-62618-165-6.
  3. J.C. Kurnia, A.P. Sasmito*, S.V. Jangam, A.S. Mujumdar, Heat transfer in coiled square tubes for laminar flow of a slurry of microencapsulated phase change material (MEPCM), Heat Transfer Engineering, 34 (2013) 994-1007

Impinging jet heat and mass transfer