Abstract: In a method of measuring a viscosity of a sample based on a rotation frequency ?S of a conductive rotator rotating by applying a rotating magnetic field from outside to the rotator set in a container containing the sample and a rotation frequency ?B of the magnetic field, a constant k1 having temperature dependency of an apparatus and a constant k2 not having the temperature dependency at each temperature are found by using a equation, ?0?s=k1(?B??S)?k2, where a viscosity ?0 at specific temperature is known, and then a value of viscosity measured at the specific temperature is corrected by means of the constants k1 and k2, the rotation frequency ?S of the rotator, and the rotation frequency ?B of the magnetic field. The constant k1 may employ the temperature dependency of electric conductivity of metal used to the rotator.

Abstract: A receiver tank includes a container extending vertically along one of two spaced opposed header pipes of a condenser, a guide pipe extending from a lower end of the one header pipe into the internal space in the container and further extending upwardly within the container, the guide pipe having a number of perforations at an upper portion thereof for guiding a refrigerant into the container, and a refrigerant outlet pipe connected at a lower end portion of the container for discharging the refrigerant from the container. The guide pipe is inserted into the container from the bottom end thereof and guides the refrigerant from the condenser into an upper part of the container. The receiver tank having such guide pipe and container is easy to assembly. The refrigerant flows out from perforations formed at the upper portion of the guide pipe and then falls down toward the bottom of the receiver tank so that a vapor-liquid separation process can be performed efficiently.

Abstract: An automotive heat exchanger of the parallel flow type includes a number of flat tubes (4), a number of corrugated fins (5), with the flat tubes and the corrugated fins being stacked alternately, the first cylindrical header tank (2) to which the tubes are connected by inserting one end thereof laterally into the first header tank, and the second cylindrical header tank (3) to which the tubes are connected by inserting the other end thereof laterally into the second header tank. The ends of each tube inserted laterally into the header tanks are cut off along the inner peripheral surfaces of the header tanks, thus minimizing the obstruction of flow in the headers. The header tanks may be made substantially elliptical.

Abstract: In a heat exchanger of the type having an end plate and a tank case joined together to form a tank and a plurality of tubes fitted in tube reception holes in the end plates for circulation therethrough of a heat exchange medium, with a gasket disposed between the tubes and the end plate, the gasket includes an inside portion covering one surface of the end plate facing the tank case, an outside portion covering the opposite surface facing away from the tank case, and a tubular connecting portion fitted in each of the tube reception holes and extending integrally between the inside portion and the outside portion. A method of making such a gasket is also disclosed, wherein a molten rubber compound is poured into a mold cavity in a mold with an end plate disposed within the mold cavity, thereby forming a gasket integrally molded on the end plate.