Conveners
Thu-Mo-Posters Session 3.3: Heat Transfer II
- Bertrand Baudouy
Mr
Mohit Kalsia
(School of Mechanical Engineering)
10/07/2014, 10:30
C-06: Heat transfer and thermo-physical properties of solids and fluids
Poster presentation (105min)
Most of the power transmission systems are to be replaced by high temperature superconducting (HTS) cables for efficient operation. These HTS cables need to be cooled below the critical temperature of superconductors used in constructing the cable. With the advent of new superconductors whose critical temperatures having reached up to 134K (Hg based), need arises to find a suitable coolant...
Mr
Mugilan Senguttuvan
(School of Mechanical Engineering)
10/07/2014, 10:30
C-06: Heat transfer and thermo-physical properties of solids and fluids
Poster presentation (105min)
The storage and generation of power has been a main objective over the past decade. To accomplish such an objective, superconductors are introduced in 1978, which observed a sublime growth in power generation systems. However, electrical losses such as AC losses and thermal losses due to conduction, convection and radiation in those superconductors are inevitable. In order to overcome and...
Mr
Jeswanth Ravula
(School of Mechanical Engineering)
10/07/2014, 10:30
C-06: Heat transfer and thermo-physical properties of solids and fluids
Poster presentation (105min)
Improving the effectiveness of transmitting energy is a new challenge in future power applications. At present, there are 40-60% of losses in the transmission of electrical energy. In order to overcome such critical challenges a novel technology is needed to be developed.
As nitrogen is main constituent in air and therefore it can be used in various applications. In this proposed work, a...
Dr
Masahiro Shiotsu
(Kyoto University)
10/07/2014, 10:30
C-06: Heat transfer and thermo-physical properties of solids and fluids
Poster presentation (105min)
Knowledge of film boiling heat transfer from a heated wire to forced flow of liquid hydrogen in a narrow gap is important for conductor design and quench analysis of superconducting magnets cooled by liquid hydrogen. However there have been few experimental data as far as we know. Film boiling heat transfer coefficients were measured for when the heater surface superheats up to 400 K under...
Mr
Yuki Horie
(Kyoto-University)
10/07/2014, 10:30
C-06: Heat transfer and thermo-physical properties of solids and fluids
Poster presentation (105min)
In operating superconducting devices cooled by liquid hydrogen (LH2), joule heat caused by normal conducting transition sometimes results in film boiling which prevents the effective cooling and leads to the rapid temperature rise of superconducting devices. Knowledge of heat transfer in film boiling is important for using superconducting devices cooled by LH2 safely.
In this study, film...
Mr
Kazuya Yoneda
(Kyoto University)
10/07/2014, 10:30
C-06: Heat transfer and thermo-physical properties of solids and fluids
Poster presentation (105min)
Liquid hydrogen has excellent properties such as large latent heat, low viscosity and so on. Therefore liquid hydrogen is expected to be used as a coolant for the high critical temperature superconducting devices. The larger heat is inputted to the superconducting device, the higher the temperature of it gets in film boiling phenomenon, which make it quench. In order to design superconducting...
Dr
Zou Xin
(Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
10/07/2014, 10:30
C-06: Heat transfer and thermo-physical properties of solids and fluids
Poster presentation (105min)
Hydrocarbons and their mixtures are suitable for environment-friendly refrigerant alternatives because of their good environmental criteria and high thermodynamic performances. They are not only the natural refrigerants but also the main components of natural gas. Therefore the research on flow boiling heat transfer of the hydrocarbon mixtures is extremely important in many industrial fields....
Prof.
Katsuhide Ohira
(Institute of Fluid Science, Tohoku University)
10/07/2014, 10:30
C-06: Heat transfer and thermo-physical properties of solids and fluids
Poster presentation (105min)
Japan Aerospace Exploration Agency has been promoting the research and development of the hypersonic aircraft that can cruise at Mach 5 speed. The engine is equipped with a heat exchanger which uses liquid hydrogen fuel as a coolant for decreasing temperature of incoming air during hypersonic flight.
The objective of the study was to elucidate the pressure drop and heat transfer...
Prof.
Katsuhide Ohira
(Institute of Fluid Science, Tohoku University)
10/07/2014, 10:30
C-06: Heat transfer and thermo-physical properties of solids and fluids
Poster presentation (105min)
Cryogenic slush fluids such as slush hydrogen and slush nitrogen are solid-liquid two-phase fluids containing solid particles in a liquid. There are high expectations as a functional thermal fluid for use of slush fluids in various applications. The presenter has proposed and has been developing a high-efficiency hydrogen energy system which uses slush hydrogen as a means of long-distance...
Lionel DUBAND
(CEA)
10/07/2014, 10:30
C-06: Heat transfer and thermo-physical properties of solids and fluids
Poster presentation (105min)
This paper reports on the development and the thermal tests of three super fluid helium heat pipes. Two of them are designed to get large transport capacity (4 mW at 1.7 K), they feature a copper braid located inside a 6 mm outer diameter stainless tube fitted with copper ends for mechanical anchoring. The other heat pipe has no copper braid and is designed to get much smaller heat transport...
Mr
Weiping Zhu
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
10/07/2014, 10:30
C-06: Heat transfer and thermo-physical properties of solids and fluids
Poster presentation (105min)
A high performance heat exchanger is a critical component in a cryogenic system and its performance is typically very sensitive to the axial conduction, the parasitic heat loads and property variations. This paper presents a general 1-D model for multi-stream plate-fin parallel flow heat exchanger. The governing equations are solved by both analytical method and numerical method. The results...
HIDEKI TATSUMOTO
(Japan Atomic Energy Agency)
10/07/2014, 10:30
C-06: Heat transfer and thermo-physical properties of solids and fluids
Poster presentation (105min)
Liquid hydrogen has been used as a fuel for a rocket engine and moderator material for cold neutron source. Recently, it is expected as a coolant for high-Tc superconducting devices because of its excellent cooling properties. The knowledge of transient heat transfer in forced flow of liquid hydrogen is necessary for the cooling design. However, there have been no experimental data on the...
Dr
Bertrand Baudouy
(CEA Saclay)
10/07/2014, 10:30
C-06: Heat transfer and thermo-physical properties of solids and fluids
Poster presentation (105min)
Some superconducting magnets, such as the CMS or R3B-GLAD, are passively cooled in helium two-phase natural circulation loop configuration. Whereas a good knowledge of steady state operation of such systems is available, transient phenomena taking place during non-stationary solicitation of such cooling systems, by sudden heat load increase, are still in course of study.
We performed...
Prof.
Mao Qiong Gong
(Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
10/07/2014, 10:30
C-06: Heat transfer and thermo-physical properties of solids and fluids
Poster presentation (105min)
As a more efficient and environment-friendly refrigerant alternative, R290 has good environmental characteristics and high thermodynamic performances. It has been used to replace R22 and R502 in the refrigeration industry. The mechanisms of boiling heat transfer and pressure drop are intimately linked with the prevailing two phase flow regime. Therefore, it is necessary to study the two-phase...