(Photos by Fukuda)
We have been engaged in a broad program of experimental and theoretical studies on heat transfer. Our particular motivation has generally been the problems associated with nuclear reactor accidents and power plant boilers. We also specialize in general heat transfer problems such as heat exchanger performance and energy conservation problems. Rather than studying complicated problems directly, we have chosen to examine more fundamental problems that can shed light on particular aspects of the overall process.Our current researches are focused on single-phase heat transfer, boiling heat transfer, transient heat transfer, heat transfer process accompanying chemical reactions.
For education programs
(1)Undergraduate course: Heat Transfer Engineering, Thermal Engineering
of Nuclear Reactors, Marine Engineering Experiment,Material and Environmental
Engineering(2)Graduate course: Marine Thermal Energy Transport,Advanced
For research projects
This Laboratory is equipped with the following Main Equipment: (1) Boiling
heat transfer experimental apparatus (2) Forced convection heat transfer
test loop of flowing water (3) Heat transfer test loop of flowing gas (4)
Mono-tube boiler (5) High speed video cameraGeneral researches activities:
referring to the following Research Topics
(1) Transient Boiling Heat Transfer Caused by Rapid Depressurization
(2) Transient Boiling Heat Transfer for Exponential Heat Input
The correct understanding and prediction of the transient boiling heat transfer caused by rapidly increasing heat input (power transient) or decreasing pressure (pressure transient) become important as the database for the safety assessment of nuclear reactor accidents caused by a power burst and a pipe rapture. They are also interesting as a fundamental problem of time varying boiling heat transfer. Our current research is focused on obtaining systematically the database for the critical heat fluxes resulting from exponentially increasing heat inputs with various exponential periods and the database for critical heat fluxes under rapid pressure reduction.
(3) Steady-state and Transient Forced Convection Heat Transfer in Gases
(Experimental and Numerical Approaches)
Transient heat transfer coefficients for forced convection flow of gas (such as Helium, Argon et al.) over a horizontal cylinder are measured using a forced convection test loop. The platinum heater was heated by electric current with an exponential increase of Q0exp(t/τ) . The effects of flowing velocity, heat input increasing period on the heat transfer process are investigated.
(4) Forced Convection Film Boiling Heat Transfer
The knowledge of forced convection film boiling heat transfer is important as the basic of understanding the reflooding phenomenon during the emergency cooling in a water-cooled nuclear reactor under a loss of coolant accident. The purpose of this study is to derive a new correlation for forced convection film boiling heat transfer based on theoretical solution and authors previous experimental data under wide ranges of experimental conditions.
(5) Heat Transfer Process Accompanying Chemical Reactions
To achieve reduction of primary energy consumption and prevent deterioration of global environment, a liquid-phase methanol synthesis process was investigated to recover wasted or unused discharged heat from industrial sources for the thermal energy demands of residential and commercial areas. Studies are carried out on the transport and reaction processes of the thermal energy recovery, transportation, and utilization system by methanol synthesis and decomposition.