Study on heat transfer and flow characteristics of ice slurry in a small pipe
Tokyo Institute of Technology
Mechanical Sciences and Engineering Department
Graduate School of Science and Engineering
Okawa Labortary
11M10510 KYAW MYO OO
Abstract
In this study, the results of studies on heat transfer and flow characteristics of ice slurry were experimentally investigated by using a horizontal, stainless steel tube, 0.8 m long and 10.2 mm internal diameter. The technical utilization of ice slurry –
a mixture of small (typically 0.5 to 1.7 mm in diameter) ice particles and a carrier fluid - a mixture of water and ethanol 5 wt.% – allows the phase change material, “ice”, to be pumped to the testing section. Most aqueous solutions used as single-phase secondary fluids can also be used as ice slurry. In this study, the ice slurry velocity of the experiments was varied from 0.5 to 4.7 m/s which encompassed the laminar and turbulent flow range. Two types of ice slurries containing different sizes of ice particles were generated by the scraped-surface type ice slurry generator.
The values of parameter (ice packing factor IPF, Reynolds number and ice particle size) corresponding to the laminar, transition and turbulent flow were determined. For the laminar flow, it was found that the pressure drop and heat transfer coefficient of the ice slurry mainly depend on ice particle size and ice packing factor. The rate of pressure drop is linearly increased in the results of the small ice particle size. On the other hand, in case of turbulent flow condition, the ice particle size is not influenced on the pressure drop and heat transfer rate. The heat transfer coefficients are almost constant in different IPF region. It is seen that a thermal boundary layer rapidly develops under turbulent flow regime. The values of Nusselt number increase with IPF increasing in the case of laminar flow. For the turbulent flow, there is no change condition.
One of the characteristics of ice slurries is that the particles disappear in the melting process and it is not possible to use in constant flow. On the other hand, the heat transfer characteristics of ice slurry during production are important for the experiment. The effect of the time behavior of ice particle size on the heat transfer properties should be quantified.
How do we make the most out of a QBR that can define the tone of your customer relationships for the next 3 months? The key: delivering on what you have promised & demonstrate key value takeaways.
Intervención en el I Seminario de Comunicación Política de Alicante (18 abril 2013)
http://www.gutierrez-rubi.es/2013/03/29/zw-342-i-seminario-de-comunicacion-politica-de-alicante/
Study on heat transfer and flow characteristics of ice slurry in a small pipe
Tokyo Institute of Technology
Mechanical Sciences and Engineering Department
Graduate School of Science and Engineering
Okawa Labortary
11M10510 KYAW MYO OO
Abstract
In this study, the results of studies on heat transfer and flow characteristics of ice slurry were experimentally investigated by using a horizontal, stainless steel tube, 0.8 m long and 10.2 mm internal diameter. The technical utilization of ice slurry –
a mixture of small (typically 0.5 to 1.7 mm in diameter) ice particles and a carrier fluid - a mixture of water and ethanol 5 wt.% – allows the phase change material, “ice”, to be pumped to the testing section. Most aqueous solutions used as single-phase secondary fluids can also be used as ice slurry. In this study, the ice slurry velocity of the experiments was varied from 0.5 to 4.7 m/s which encompassed the laminar and turbulent flow range. Two types of ice slurries containing different sizes of ice particles were generated by the scraped-surface type ice slurry generator.
The values of parameter (ice packing factor IPF, Reynolds number and ice particle size) corresponding to the laminar, transition and turbulent flow were determined. For the laminar flow, it was found that the pressure drop and heat transfer coefficient of the ice slurry mainly depend on ice particle size and ice packing factor. The rate of pressure drop is linearly increased in the results of the small ice particle size. On the other hand, in case of turbulent flow condition, the ice particle size is not influenced on the pressure drop and heat transfer rate. The heat transfer coefficients are almost constant in different IPF region. It is seen that a thermal boundary layer rapidly develops under turbulent flow regime. The values of Nusselt number increase with IPF increasing in the case of laminar flow. For the turbulent flow, there is no change condition.
One of the characteristics of ice slurries is that the particles disappear in the melting process and it is not possible to use in constant flow. On the other hand, the heat transfer characteristics of ice slurry during production are important for the experiment. The effect of the time behavior of ice particle size on the heat transfer properties should be quantified.
How do we make the most out of a QBR that can define the tone of your customer relationships for the next 3 months? The key: delivering on what you have promised & demonstrate key value takeaways.
Intervención en el I Seminario de Comunicación Política de Alicante (18 abril 2013)
http://www.gutierrez-rubi.es/2013/03/29/zw-342-i-seminario-de-comunicacion-politica-de-alicante/