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Title: Enhanced heat transfer characteristics of viscous liquid flows in a chevron plate heat exchanger

Abstract

Thermal processing and manufacturing in the chemical, foods, pharmaceutical, hygiene products, and biochemical industries invariably involve heating and cooling of highly viscous fluid media. These fluids tend to flow in the low Reynolds number regime, inherently have relatively low heat transfer coefficients, and are often temperature sensitive and prone to thermal degradation in the presence of large temperature differences. In recent times, plate heat exchangers (PHEs) have found increasing usage in such applications, primarily due to their features that promote enhanced heat transfer, and provide for the flexibility in altering their unit thermal size with ease, close approach temperature operation, and mitigation of thermal degradation of the process fluid. Here, steady-state heat transfer and pressure drop data for single-phase viscous fluid flows (2 {le} Re {le} 400) in a single-pass U-type counterflow plate heat exchanger (PHE) with chevron plates are presented. With vegetable oil as test fluid (130 {lt} Pr {lt} 290), three different plate arrangements are employed: two symmetric ({beta} = 30 deg/30 deg and 60 deg/60 deg) and one mixed ({beta} = 30 deg/60 deg). The effects of chevron angle {beta}, corrugation aspect ratio {gamma}, and flow conditions (Re, Pr, {mu}/{mu}{sub w}) on Nu and f characteristics ofmore » the PHE are delineated. The results show a rather complex influence of plate surface corrugations on the enhanced thermal-hydraulic behavior. Relative to the performance of equivalent flat-plate packs, chevron plates sustain up to 2.9 times higher heat transfer rates on a fixed geometry and constant pumping power basis, and require up to 48% less surface area for the fixed heat load and pressure drop constraint.« less

Authors:
; ;
Publication Date:
Research Org.:
Univ. of Cincinnati, OH (US)
OSTI Identifier:
20005635
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Heat Transfer; Journal Volume: 121; Journal Issue: 4; Other Information: PBD: Nov 1999
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; HEAT EXCHANGERS; AUGMENTATION; HEAT TRANSFER; FORCED CONVECTION; INDUSTRIAL PLANTS; FLUID FLOW; VISCOUS FLOW; PRESSURE DROP; COUNTERFLOW SYSTEMS

Citation Formats

Muley, A., Manglik, R.M., and Metwally, H.M.. Enhanced heat transfer characteristics of viscous liquid flows in a chevron plate heat exchanger. United States: N. p., 1999. Web. doi:10.1115/1.2826051.
Muley, A., Manglik, R.M., & Metwally, H.M.. Enhanced heat transfer characteristics of viscous liquid flows in a chevron plate heat exchanger. United States. doi:10.1115/1.2826051.
Muley, A., Manglik, R.M., and Metwally, H.M.. Mon . "Enhanced heat transfer characteristics of viscous liquid flows in a chevron plate heat exchanger". United States. doi:10.1115/1.2826051.
@article{osti_20005635,
title = {Enhanced heat transfer characteristics of viscous liquid flows in a chevron plate heat exchanger},
author = {Muley, A. and Manglik, R.M. and Metwally, H.M.},
abstractNote = {Thermal processing and manufacturing in the chemical, foods, pharmaceutical, hygiene products, and biochemical industries invariably involve heating and cooling of highly viscous fluid media. These fluids tend to flow in the low Reynolds number regime, inherently have relatively low heat transfer coefficients, and are often temperature sensitive and prone to thermal degradation in the presence of large temperature differences. In recent times, plate heat exchangers (PHEs) have found increasing usage in such applications, primarily due to their features that promote enhanced heat transfer, and provide for the flexibility in altering their unit thermal size with ease, close approach temperature operation, and mitigation of thermal degradation of the process fluid. Here, steady-state heat transfer and pressure drop data for single-phase viscous fluid flows (2 {le} Re {le} 400) in a single-pass U-type counterflow plate heat exchanger (PHE) with chevron plates are presented. With vegetable oil as test fluid (130 {lt} Pr {lt} 290), three different plate arrangements are employed: two symmetric ({beta} = 30 deg/30 deg and 60 deg/60 deg) and one mixed ({beta} = 30 deg/60 deg). The effects of chevron angle {beta}, corrugation aspect ratio {gamma}, and flow conditions (Re, Pr, {mu}/{mu}{sub w}) on Nu and f characteristics of the PHE are delineated. The results show a rather complex influence of plate surface corrugations on the enhanced thermal-hydraulic behavior. Relative to the performance of equivalent flat-plate packs, chevron plates sustain up to 2.9 times higher heat transfer rates on a fixed geometry and constant pumping power basis, and require up to 48% less surface area for the fixed heat load and pressure drop constraint.},
doi = {10.1115/1.2826051},
journal = {Journal of Heat Transfer},
number = 4,
volume = 121,
place = {United States},
year = {Mon Nov 01 00:00:00 EST 1999},
month = {Mon Nov 01 00:00:00 EST 1999}
}