Abstract: A cooler has a simple structure and stably exhibits a good cooling effect, and includes: a working fluid container; and a cooling member provided in the container to be brought into contact with the working fluid and to face a heat generation element. The cooling member has a stacked structure including a first porous body and a second porous body. The first porous body includes: a part supplying the working fluid, by capillary action, to a contact part that is in contact with the heat generation element; and a part discharging vapor generated in the contact part to the second porous body. The second porous body includes: a part supplying the working fluid to the first porous body; and part discharging the vapor discharged from the first porous body, into the working fluid. The second porous body has a higher permeability of the working fluid than the first porous body.

Abstract: There is provided a cooler which has a simple structure and stably exhibits a good cooling effect. A cooler includes: a container accommodating a working fluid; and a cooling member provided, in the container so as to be brought into contact with the working fluid and to face a heat generation element. The cooling member has a stacked structure including a first porous body provided on the heat generation element side and a second porous body provided on the working fluid side. The first porous body includes: a first working fluid supply part supplying the working fluid, by capillary action, to a contact part which is in contact with the heat generation element; and a first vapor discharge part discharging vapor generated in the contact part to the second porous body side. The second porous body includes: a second working fluid supply part supplying the working fluid to the first porous body; and a second vapor discharge part discharging the vapor discharged from the first porous body, into the working fluid.

Abstract: A self-excited oscillating flow heat pipe includes a heating unit having a wick therein; a cooling unit filled with a working fluid; a connection channel which rectilinearly connects the heating unit with the cooling unit, and has a smaller channel cross-sectional area than the channel cross-sectional area of the heating unit; a liquid plug protruding into the connection channel from the cooling unit and containing the working fluid; and a vapor plug in the heating unit containing the vaporized working fluid. The liquid plug oscillates self-excitedly in the connection channel.

Abstract: A droplet-jetting device having high jetting ability, which includes an actuator featuring a liquid chamber and a heater and a controller. The liquid chamber has an aperture for jetting droplets of an operation liquid which the liquid chamber accommodates. The heater provides thermal energy to the operation liquid and forms bubbles for droplet-jetting. The controller controls a driving signal, which is inputted to the heater. The driving signal includes a preparatory heating pulse signal, which corresponds to a preparatory heating energy for preparatory heating of the operation liquid, and a trigger pulse signal, which corresponds to a jetting thermal energy for bubble creation and growth. A power supplied by the preparatory heating pulse signal is smaller than a power supplied by the trigger pulse signal, and a heating duration by the preparatory heating pulse signal is longer than a heating duration by the trigger pulse signal.

Abstract: A droplet-jetting device having high jetting ability, which includes an actuator featuring a liquid chamber and a heater and a controller. The liquid chamber has an aperture for jetting droplets of an operation liquid which the liquid chamber accommodates. The heater provides thermal energy to the operation liquid and forms bubbles for droplet-jetting. The controller controls a driving signal, which is inputted to the heater. The driving signal includes a preparatory heating pulse signal, which corresponds to a preparatory heating energy for preparatory heating of the operation liquid, and a trigger pulse signal, which corresponds to a jetting thermal energy for bubble creation and growth. A power supplied by the preparatory heating pulse signal is smaller than a power supplied by the trigger pulse signal, and a heating duration by the preparatory heating pulse signal is longer than a heating duration by the trigger pulse signal.