We describe two primary standards for gas flow in the range from 0.1 to 1000 μmol/s. (1 μmol/s ≅ 1.3 cm(3)/min at 0 °C and 1 atmosphere.) The first standard is a volumetric technique in which measurements of pressure, volume, temperature, and time are recorded while gas flows in or out of a stainless steel bellows at constant pressure. The second standard is a gravimetric technique. A small alu...

This paper describes a process of numerical testing and optimization the ultrasonic gas meter channel. A conventional flowmeter requires large installation space due to quality stability velocity profile. Previously, shape inner channel was optimized reach suitable flow field for measurement. The goal this work is find an optimal design reduced size achieve stable profile with minimum disturban...

Korean households generally prefer to use induction cooktops rather than gas stoves because of their greater convenience and safety features. This paper tries to investigate whether Korean households are willing to pay a premium for replacing their gas stoves, which are currently common in Korea, with induction cooktops, from the perspective of convenience and safety. To this end, a contingent ...

energy of a moving gas into rotational energy. At a given flow rate Q, the rotor of the turbine meter would spin at an angular velocity ωi as shown in Figure 1. With an idealized turbine meter, the rotational speed of the rotor would be directly proportional to the volumetric flow rate of the flowing medium. The relationship between flow rate Q and the angular velocity ωi can be expressed as fo...