Study on Thermal Effect of Nozzle Flowmeter Based on Fluid‐Solid Coupling Method

Abstract

Nozzle flowmeter is widely used in industry. In this paper, in order to study the influence of different flow rates and inner wall temperatures on the thermal effect and flow field of the nozzle flowmeter, the fluid-solid coupling numerical calculation of the thermal effect and flow field of nozzle flowmeter is carried out under four different flow rates and five different inner wall temperatures. It is found that, with the increase of flow rate, the heat transfer effect of the nozzle flowmeter is weakened under different inner wall temperatures. The pressure distribution in the fluid domain, the dynamic stress, and fluid-induced vibration deformation generated by the fluid of the nozzle flowmeter are less affected by inner wall temperatures.

Effect of Weld Shape on Temperature Field of Nozzle Flowmeter

“…Three-dimensional modeling of the components of the nozzle flowmeter with the structure is shown in Figure 2a. ICEM 16.0 software was used to divide the meshes, all adopting well-adapted unstructured tetrahedral mesh and completed mesh independence verification [3]. The mesh numbers of the front measuring tube, rear measuring tube, eight-slot nozzle, and weld metal domain in the original structure of the flowmeter were 63,875, 63,872, 1,424,041 and 38,623, respectively, and the total mesh number was 1,590,411.…”

“…A nozzle flowmeter mainly consists of a front measuring tube, rear measuring tube, nozzle, and weld metal. The flowmeter structure is shown in Figure 1, and detailed geometric parameters have been reported by previous researchers [3]. The measuring tube is divided into front and rear measuring tubes, which are connected by the eight-slot nozzle and weld metal.…”

“…Based on the static pressure difference, the nozzle flowmeter has the ability to detect the flow rate [1]. At present, many researchers [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] have studied the internal flows and external characteristics of various types of flowmeters under different conditions from different aspects, and some researchers [21][22][23][24][25] have designed more suitable new flowmeters because of the limitations of the operating environment and the shortcomings of existing flowmeters.…”

“…It was found that the thermal stress and thermal deformation value in the pressure taps and inlet and outlet areas increased with the increase in wall temperature. Tong et al [3] calculated the fluid-solid coupling of thermal effects and flow fields of nozzle flowmeters at four different flows and five different inner-wall temperatures. The results showed that the heat transfer effect decreased with the increase in flow rate and inner-wall temperature.…”

“…To sum up, literature has been published on various types of flowmeters for systematic studies, such as nozzle flowmeters [1,3,4,24], orifice flowmeters [5][6][7], turbine flowmeters [9][10][11][12], Coriolis flowmeters [13][14][15], V-cone flowmeters [16,17], and ultrasonic flowmeters [8,[20][21][22]25].Through this research, researchers have revealed the internal flow characteristics and external characteristics of each flowmeter, improved the measurement accuracy of the flowmeter, and lifted the environmental restrictions on using flowmeters. However, it was found that the effect of different weld shapes on the temperature field within the solid domain of the nozzle flowmeter has yet to be studied.…”