Heat exchange promotion member and heat exchanger

A heat exchange method for exchanging heat with a fluid by using a heat exchanger, wherein

• the heat exchanger includes:
• a plurality of heat dissipation fins that are arranged at constant intervals and exchange heat with the fluid;
• and
• a heat transfer tube that is thermally coupled with the heat dissipation fins and allows a heat medium to flow therein, the heat medium transporting heat energy,
• when a direction that is parallel to surfaces of the heat dissipation fins and is along a flow of the fluid is a first direction,
• a direction that is opposite from the first direction is a second direction,
• a direction that is perpendicular to the surfaces of the heat dissipation fins and is orthogonal to the first direction is a third direction,
• a direction that is opposite from the third direction is a fourth direction,
• a direction that is parallel to the surfaces of the heat dissipation fins and is orthogonal to the first direction is a fifth direction, and
• a direction that is opposite from the fifth direction is a sixth direction, the heat dissipation fins each include
• a planar part that is a flat surface substantially parallel to the first direction, and
• a raised part that continues with the planar part and protrudes only with respect to the third direction,
• a plurality of shapes each being a combination of the planar part and the raised part are formed at substantially constant intervals along the first direction,
• the raised part alternately has a first raised portion slanted toward the fifth direction along the first direction and a second raised portion slanted toward the sixth direction along the first direction,
• a portion where the first raised portion and the second raised portion are continuous with each other forms a substantially letter-V shape,
• the fluid flows along the planar part and the raised part, so that the heat dissipation fins and the fluid exchange heat,
• the flow of the fluid forms a first swirl near the planar part and forms a second swirl near the raised part, and
• a rotation direction of the fluid in the first swirl and a rotation direction of the fluid in the second swirl are opposite from each other,
• wherein
• the flow of the fluid at a surface of the heat dissipation fin that faces in the third direction and the flow of the fluid at a surface of the heat dissipation fin that faces in the fourth direction become asymmetrical, which enhances the flow that moves around to a back of the heat transfer tube, reducing a profile drag caused by an existence of the heat transfer tube.