A new flow pattern map for flow boiling in microfin tubes

A Review on Convective Boiling Heat Transfer of Refrigerants in Horizontal Microfin-Tubes: A Typical Example

“…Rollmann and Spindler [1] modified the procedure from Wojtan et al [2] and introduced their method to build the flow pattern map for boiling in microfin tube as given in below (Figure 2):…”

“…Apply the flow pattern map of Rollmann and Spindler [1] to present in here. At first, calculate the transition lines between one regime to another as a function of quality x and use the classification of the regimes on the map:…”

“…While for microfin is still unclear especially for the newest refrigerant. With the method of Rollmann et al [1], the pattern of boiling in microfin tube could be classify in such fully stratified flow, stratified wavy flow, the combination of slug and stratified wavy flow, helix flow, annular flow. In order to build this method, Rollmann et al was updated the method of Wojtan et al [2] which was introduced for smooth tube.…”

Experiment investigation of two-phase flow pattern transition and frictional pressure drop of R600a in a horizontal tube

“…而传热 系数、压降和空隙率又受到流型的影响, 因为不同的 流型会产生引起不同的气液相分布从而影响传热、 压 降和空隙率. Rollmann和Spindler [3] 同时也指出流型 的发展对压降的变化有着重要的影响. 两相摩擦压 降作为流体动力学特性之一, 是换热器、制冷系统、 热 控 系 统 等 工 业 设 备 和 系 统 设 计 与 优 化 的 重 要 参 数 [4] .…”

Visual Experimental Study on Two Phase Flow Patterns of the Evaporative Cooling System

“…However, due to the complexity of boiling heat transfer, no common accurate prediction model for high power density two phase flow heat transfer and pressure drop has been established. Accurate flow pattern division is crucial to the calculation of boiling [6]. Therefore, the two-phase flow patterns of flow boiling should be investigated in the first place.…”