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s. Fig. 2 shows the flow regime map for
air water system without drag reducing agent. Three different flow
patterns were observed: trickle flow, pulse flow and dispersed bub-
ble flow. A C-shaped transition boundary was observed between
different flow patterns. The flow patterns and flow regime bound-
aries (C-shape curve) observed in this study were compared with
the Trivizadakis et al. [10] flow map (6mm-dia, 0.36-voidage, air-
water) which showed good agreement.
In a single phase flow through a fixed bed column, the operat-
ing flow regimes are normally classified as laminar and turbulent,
which is generally characterized by a single dimensionless group
in the form of the Reynolds number with the established boundary
conditions. But in the case of fixed bed gas-liquid-solid columns,
the dynamic behavior is more complex due to the complex interac-
tions between the contacting phases. The flow patterns in a down-
flow packed bed contactor depends on the mass flow rate of the
inpidual phases, size and shape of the particles, bed voidage and
the physical properties of the liquid systems used. For establishing
a generalized flow boundary equation between different flow pat-
terns, two dimensionless parameters ‘X’ and ‘Y” proposed by Char-
pentier and Favier [11] were used.
To study the effect of drag reducing agent on flow boundary, a known
quantity of xanthan gum (DRA) was added to water and the mix-
ture was used as liquid phase, and the flow patterns were visually摘要：减租是填充床接触器中降低能耗的重要技术之一。本文涉及空气-水系统在是否含有减阻剂（DRA），两相压降、摩擦系数以及用黄原胶作为减阻剂减阻下的流型转变的实验研究。在两相压降数据下减阻进行量化。从目前的观察发现，减阻的百分率是随着DRA的浓度增加而增加。这仅仅在浓度为300ppm~800ppm的范围下有效。实验结果表明，用黄原胶（800ppm）作为DRA下，可以实现最大为80%的减阻。与此同时，实验数据验证了现有文献的相关性。论文网
关键词：减阻；顺流式填充床；两相摩擦因素；黄原胶