Abstract: An exhaust gas purification filter includes: a honeycomb structure body having partition walls for defining a plurality of cells that extend from an inflow end face to an outflow end face; an inflow side plugging portion; an outflow side plugging portion; and a porous surface trapping layer which is disposed on an inflow surface which is a surface on an inflow cell side which is the cell in which the outflow side plugging portion is disposed, among surfaces of the partition walls, in which the surface trapping layer has a thickness of 10 to 60 ?m and an average pore diameter of 0.3 to 5 ?m, and in a section which is parallel to a cell extending direction.

Abstract: An exhaust system includes: an exhaust pipe defining an exhaust path of exhaust gas to atmosphere; a recirculation pipe defining a recirculation path separating a part of exhaust gas passing through the exhaust pipe and allowing the part to flow back to a power unit; a purification unit purifying exhaust gas by catalyst; and a heating device heating exhaust gas before purification to activate the purification ability of the catalyst. The heating device includes: an acoustic-wave generator generating acoustic waves by absorbing heat from exhaust gas passing through the recirculation pipe and by giving the heat to working fluid to cause the working fluid to oscillate, and a heat transfer part transferring heat of exhaust gas in the exhaust pipe passing through a downstream position from the purification unit to exhaust gas in the exhaust pipe passing through an upstream position from the purification unit by using acoustic waves.

Abstract: A honeycomb filter includes a honeycomb structure body having porous partition walls defining a plurality of cells, inflow side plugging portions, and outflow side plugging portions, and in a cross section perpendicular to a cell extending direction, the whole periphery of each of outflow cells is surrounded by an inflow cell group, inflow cells are defined by inflow/outflow partition walls which are the partition walls defining the outflow cell and inflow/inflow partition walls which are the partition walls intersecting the inflow/outflow partition walls, a surface area A1 of the inflow/outflow partition wall of the inflow cell and a surface area A2 of the inflow/inflow partition wall of the inflow cell satisfy a relation of 1.2?A1/A2?2, and in the partition wall, an average pore diameter of a surface region is from 4 to 60% of an average pore diameter of a central region.

Abstract: A plugged honeycomb structure includes a plurality of honeycomb segments, a bonding layer, and plugging portions plugging open ends of cells of the honeycomb segments. The honeycomb segments include circumferential segments and central segments. The circumferential segments include at least one specific circumferential segment in which pressure loss with soot when an amount of the deposited soot is 4 g/L is higher than the pressure loss with soot of the central segment as much as 15% or more and in which an open frontal area of the circumferential segment is the same as or larger than an open frontal area of the central segment. In a cross section of a honeycomb structure body which is perpendicular to an extending direction of the cells, a ratio of an area of the specific circumferential segment is 4% or more to a total area of the circumferential segments and the central segments.

Abstract: A honeycomb structure body is constituted of a circumferential region including the outermost circumference in a cross section of the honeycomb structure body which is perpendicular to an extending direction of cells, and a central region excluding the circumferential region. The circumferential region includes a specific circumferential region in which pressure loss with soot when an amount of the deposited soot is 4 g/L is higher than the pressure loss with soot of the central region as much as 15% or more and in which an open frontal area of the circumferential region is the same as or larger than an open frontal area of the central region. In the cross section of the honeycomb structure body, a ratio of an area of the specific circumferential region is 5% or more to a total area of the circumferential region and the central region.

Abstract: A heat/acoustic wave conversion component having a first end face and a second end face, includes a partition wall that defines a plurality of cells extending from the first end face to the second end face, inside of the cells being filled with working fluid that oscillates to transmit acoustic waves, the heat/acoustic wave conversion component mutually converting heat exchanged between the partition wall and the working fluid and energy of acoustic waves resulting from oscillations of the working fluid. Hydraulic diameter HD of the heat/acoustic wave conversion component is 0.4 mm or less, where the hydraulic diameter HD is defined as HD=4×S/C, where S denotes a cross-sectional area of each cell perpendicular to the cell extending direction and C denotes a perimeter of the cross section, and the heat/acoustic wave conversion component has three-point bending strength of 5 MPa or more.

Abstract: The honeycomb filter includes a honeycomb substrate having porous partition walls defining a plurality of cells and plugging portions. In a cross section, the cells are arranged so that a periphery of an inlet plugged cell including an open end whose shape is a square in which a length of one side is L1 is surrounded with four rectangular outlet plugged cells each including an open end whose shape is a rectangle in which a length of one side is L1 and a length of the other side is L2 (L1>L2) and four square outlet plugged cells each including an open end whose shape is a square in which a length of one side is L2. A partition wall center distance a, a partition wall center distance b and a partition wall thickness t satisfy the following equation (1): 0.95<b/at<1.90 ??(1).

Abstract: A heat/acoustic wave conversion component includes a partition wall that defines a plurality of cells extending from a first end face to a second end face, and has a cell hydraulic diameter HD of 0.4 mm or less, an end face open frontal area of 60% or more and 93% or less, and heat capacity per unit length in the extending direction that tends to decrease with distance from the first end face. A first end portion on the first end face side that accounts for a region of 10% of a total length of the heat/acoustic wave conversion component has 1.1 times or more the heat capacity of that of a second end portion on the second end face side that accounts for a region of 10% of the total length.

Abstract: A heat/acoustic wave conversion component includes a partition wall that defines a plurality of cells extending from a first end face to a second end face and mutually converts heat exchanged between the partition wall and the working fluid and energy of acoustic waves resulting from oscillations of the working fluid. Hydraulic diameter HD of the heat/acoustic wave conversion component is 0.4 mm or less, where the hydraulic diameter HD is defined as HD=4×S/C, where S denotes an area of a cross-section of each cell perpendicular to the cell extending direction and C denotes a perimeter of the cross section. The heat/acoustic wave conversion component has an open frontal area at each end face of 60% or more and 93% or less. The partition wall has arithmetic surface roughness (Ra) at the surface of 3 ?m or more and 20 ?m or less.

Abstract: A heat/acoustic wave conversion component includes a plurality of monolithic honeycomb segments each including a partition wall that defines a plurality of cells extending between both end faces, and the plurality of monolithic honeycomb segments each mutually converts heat exchanged between the partition wall and the working fluid in the cells and energy of acoustic waves resulting from oscillations of the working fluid. In the heat/acoustic wave conversion component including the plurality of honeycomb segments each being monolithic configured, hydraulic diameter HD of the cells is 0.4 mm or less, open frontal area of the honeycomb segments is 60% or more and 93% or less, heat conductivity of the honeycomb segments is 5 W/mK or less, and a ratio HD/L of the hydraulic diameter HD to the length L of the honeycomb segment is 0.005 or more and less than 0.02.

Abstract: A honeycomb structure includes a honeycomb structure body having a partition wall which is constituted of a porous body. The porous body includes a refractory aggregate and a bonding material. The porous body constituting includes the bonding material at a mass proportion of 20 to 35 mass %. In an observation of a cross section of the partition wall with an electron microscope, when observing any given ten visual fields meeting a following condition (1), the number of refractory aggregates meeting a following condition (2) is five pieces or more in all of the ten visual fields. Condition (1): a proportion of an area occupied by the bonding material is 30% or more. Condition (2): the refractory aggregate has a particle diameter of 5 ?m or more, and 60% or more of an outer circumference of the refractory aggregate is surrounded by the bonding material.

Abstract: A manufacturing method of a honeycomb structure forming die includes a linear slit forming step of forming, in a kneaded material discharging surface of a die substrate, a plurality of linear slits which are straight from one end to the other end on the kneaded material discharging surface, a slit sealing material disposing step of disposing a slit sealing material in parts of the plurality of linear slits, and a back hole forming step of forming back holes to introduce a kneaded material, in a kneaded material introducing surface of the die substrate which is present on a side opposite to the kneaded material discharging surface.

Abstract: A heat/acoustic wave conversion component includes a partition wall that defines a plurality of cells, inside of the cells being filled with fluid that oscillates to transmit acoustic waves, the heat/acoustic wave conversion component mutually converting heat exchanged between the partition wall and the fluid and energy of acoustic waves resulting from oscillations of the fluid. The plurality of cells have an average of hydraulic diameters HDs that is 0.4 mm or less in a plane perpendicular to the cell extending direction, the heat/acoustic wave conversion component has an open frontal area at each end face of 60% or more and 93% or less, and distribution of hydraulic diameters HDs of the plurality of cells has relative standard deviation that is 2% or more and 30% or less.

Abstract: To manufacture a thermoacoustic energy converting element part, a plurality of first plates and a plurality of second plates are formed. The first plate is provided with a plurality of linear penetration slits which are in parallel with each other and separated along a direction perpendicular to an extending direction of the slit. The slit penetrates the first plate in a thickness direction. The second plate is not provided with any penetration slit. A plate assembly is formed by layering some of the plurality of first plates between adjacent two of the plurality of second plates of which main surfaces face each other. The plate assembly is provided with a plurality of communicating passages formed with the penetration slits adjoining each other in a layering direction. Portions of the assembly at both ends in the extending direction of the penetration slits are cut off to open the communicating passages on both sides of the assembly.

Abstract: A heat/acoustic wave conversion unit includes a heat/acoustic wave conversion component and two heat exchangers. Hydraulic diameter HD of the cells in the heat/acoustic wave conversion component is 0.4 mm or less, and a ratio HD/L of HD to the length L of the heat/acoustic wave conversion component is from 0.005 to 0.02. One of the heat exchangers includes a heat-exchanging honeycomb structure and an annular tube that surrounds a circumferential face of the heat-exchanging honeycomb structure. The annular tube includes a structure body that is disposed in the channel to increase a contact area with the heated fluid, an inflow port into which the heated fluid flows, and an outflow port through which the heated fluid flows out. At least one of the heat-exchanging honeycomb structure and the structure body is made of a ceramic material that contains SiC as a main component.

Abstract: A water recovery device includes: an exhaust gas pipe that is connected to a combustion device; a water generation unit that generates water by cooling exhaust gas in the exhaust gas pipe to condense water vapor in the exhaust gas; and a water container that stores water generated by the water generation unit. The water generation unit includes: an acoustic-wave generator that generates acoustic waves by absorbing heat from the exhaust gas pipe and giving the heat to working fluid, which transmits acoustic waves by oscillating, to cause the working fluid to oscillate; a transmission pipe that is internally filled with the working fluid and transmits acoustic waves generated by the acoustic-wave generator; and a cold-heat generator that generates cold heat to supply the cold heat to the exhaust gas pipe by receiving acoustic waves transmitted through the transmission pipe and giving heat to the acoustic waves.

Abstract: In a cross section perpendicular to a central axis direction of the honeycomb substrate, cells are arranged so that a periphery of an inlet plugged cell is surrounded with four rectangular outlet plugged cells and four square outlet plugged cells, and in the cross section, a partition wall center distance a, a partition wall center distance b and a partition wall thickness t satisfy the following equation (1). Additionally, an amount of a catalyst per unit volume of partition walls which is loaded onto the partition walls defining the rectangular outlet plugged cells and the inlet plugged cells is larger than an amount of a catalyst per unit volume of the partition walls which is loaded onto the partition walls defining the rectangular outlet plugged cells and the square outlet plugged cells 0.95<b/at<1.90??(1).

Abstract: An exhaust system includes: an exhaust pipe defining an exhaust path of exhaust gas to atmosphere; a recirculation pipe defining a recirculation path separating a part of exhaust gas passing through the exhaust pipe and allowing the part to flow back to a power unit; a purification unit purifying exhaust gas by catalyst; and a heating device heating exhaust gas before purification to activate the purification ability of the catalyst. The heating device includes: an acoustic-wave generator generating acoustic waves by absorbing heat from exhaust gas passing through the recirculation pipe and by giving the heat to working fluid to cause the working fluid to oscillate, and a heat transfer part transferring heat of exhaust gas in the exhaust pipe passing through a downstream position from the purification unit to exhaust gas in the exhaust pipe passing through an upstream position from the purification unit by using acoustic waves.

Abstract: A CPU of an analysis apparatus performs a fluid analysis and derives transient distribution information that represents an accumulation distribution of a particulate layer on an inflow-side inner circumferential surface of a honeycomb structure at a time point after a short time interval ?t (step S130). The CPU then repeatedly performs a fluid analysis by taking into account the transient distribution information derived previous time to repeatedly derive transient distribution information (steps S130 to S150) and then derives post-transient-analysis distribution information that represents the accumulation distribution of the particulate layer at a later time point (step S160).

Abstract: A honeycomb filter includes a honeycomb structure body having porous partition walls defining a plurality of cells, inflow side plugging portions, and outflow side plugging portions, and in a cross section perpendicular to a cell extending direction, the whole periphery of each of outflow cells is surrounded by an inflow cell group, inflow cells are defined by inflow/outflow partition walls which are the partition walls defining the outflow cell and inflow/inflow partition walls which are the partition walls intersecting the inflow/outflow partition walls, a surface area A1 of the inflow/outflow partition wall of the inflow cell and a surface area A2 of the inflow/inflow partition wall of the inflow cell satisfy a relation of 1.2?A1/A2?2, and in the partition wall, an average pore diameter of a surface region is from 4 to 60% of an average pore diameter of a central region.