PUMP

To simultaneously achieve the increase of heat transmission efficiency and the lowering of fluid resistance, and to improve pump performance.SOLUTION: A pump comprises: a substantially-flat plate-shaped porous body 1 for partitioning a first space 11 and a second space 12, and having air holes whose fine hole diameters are ten times or less of an average free stroke of an inside gas; and a substantially-flat plate-shaped heater 2 which is arranged so as to oppose the porous body 1 with a distance between the porous body 1 and itself in the first space. In a clearance between the porous body 1 and the heater 2, the gas can freely flow in almost all portions except for a partial portion, or in an entire portion, a radiation material whose emissivity is 80% or higher in a wavelength area in which radiation intensity is the highest at a temperature of the heated heater 2 is applied on a face opposing the porous body 1 of the heater 2, and by the heating of a first face of the porous body 1 facing the heater 2 while contacting with the first space 11 by radiation by the heater 2, the gas can be transferred to the first space 11 from the second space 12 via the air holes.SELECTED DRAWING: Figure 1 【課題】伝熱効率の増加と流体抵抗の低下とを同時に達成し、ポンプ性能を向上する。【解決手段】第１空間１１と第２空間１２とを仕切り、細孔径が内部の気体の平均自由行程の１０倍以下である気孔を有する略平板形状の多孔体１と、第１空間において多孔体１との間に距離を開けて多孔体１と対面するように配置される略平板形状の加熱器２と、を備え、多孔体１と加熱器２との間では、一部を除いた大部分又は全部で自由に気体が流れることが可能であり、加熱器２の多孔体１と向かい合う面には、加熱された加熱器２の温度で最も放射強度が高い波長域で放射率８０パーセント以上の放射材料が塗布され、第１空間１１に接して加熱器２と向かい合う多孔体１の第１面を加熱器２が放射により加熱することによって、気孔を介して第２空間１２から第１空間１１へ気体を移送することができる。【選択図】図１