Heat transfer enhancement of heat exchanger using rectangular channel with cavities
-
Prateek D. Malwe
,
Aarti Mukayanamath
,
Naveen Kumar Gupta
Abstract
Heat transfer enhancement is required for numerous situations, i.e., gas turbines, nuclear power plants, micro and macro scale heat transfer, airfoil cooling, electronic cooling, semiconductors, biomedical and combustion chamber lines, etc. One of the prominent ways of increasing the heat transfer coefficient from the surface of a heat exchanger is by moving the position of the thermal boundary layer to make it either thinner or break the same partially. It requires making use of an increased surface area/fins. Accordingly, the research progressed in heat transfer enhancement by using concavities/dimples of the heat exchanger surfaces to improve the heat transfer coefficient and heat transfer rate. These impregnations are made on the internal flow tubes/surfaces of the heat exchanger surfaces. The present research work aims at the experimental investigation of a heat exchanger to determine the airflow pattern and computation of heat transfer rate on the dimpled surfaces. This research work will be beneficial and applicable to heat transfer enhancement applications like micro heat transfer, where space constraint is considered. The geometries considered for the experiment include flat plates and dimpled surfaces. The parameters like Reynolds number (varied from 20,000 to 50,000), dimple depth to imprint diameter ratio (varied from 0.2 to 0.4), and heater input to the test plates (varied from 75 to 120 W) are considered for the comparisons. The results with dimpled surfaces are compared with the flat plate surfaces having no dimples. The Reynolds and Nusselt numbers rise in direct proportion to the heater input. For pin fin and dimpled plate, the ratio of Nusselt number to area average Nusselt number drops for 75 W and 100 W input. The dimpled plate with a ratio of 0.3 between imprint diameter to dimple depth had the highest ratio of Nusselt number to Nusselt number value for the entire group.
Acknowledgments
The authors thank the Director, HoD – Mechanical Engineering, and TEQIP-III officials of the Walchand College of Engineering, Sangli, for their encouragement and assistance.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission. Prateek Malwe has carried out the experimentations and written the main manuscript. Aarti have worked on the literature review section. Dr. Hitesh Panchal has revised the manuscript thoroughly. Naveen Gupta, Chander Prakash, M. Zahra helped for answering the reviewers comments.
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Research funding: This research work did not receive any funding for carrying out the experimental work.
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Conflict of interest: The authors declare no conflict of interest.
Nomenclature
- Ag
-
silver
- Al2O3
-
alumina oxide
- CFD
-
computational fluid dynamic
- D
-
imprint diameter
- DMLS
-
direct metal laser sintering
- MC-RR
-
microchannel with rectangular ribs
- MC-SOC
-
microchannel with secondary oblique channel
- MC-SOCRR
-
microchannel with secondary oblique channel in rectangular ribs
- NSGA
-
non-dominated sorting genetic algorithm
- Nu
-
Nusselt number
- Nuo
-
area average Nusselt number
- Nu/Nuo
-
ratio of Nusselt number to area average Nusselt number
- PF
-
packing factor
- PIV
-
particle image velocimetry
- Re
-
Reynolds number
- RSM
-
response surface methodology
- SEM
-
scanning electron microscope
- T 1–T9
-
surface temperatures on the cavity plate
- T10
-
temperature of air entering the inlet duct
- T 11
-
temperature of air leaving the outlet duct
- T 12
-
temperature of air leaving the apparatus
- T s
-
mean of temperatures from T 1–T 9
- T a
-
mean of temperature of T 10 & T 11
- λ
-
width
- β
-
relative rib width
- δ
-
dimple depth
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- Calendar of events
Artikel in diesem Heft
- Frontmatter
- An approach for an extension of the deflagration model in containment code system COCOSYS to separate burned and unburned atmosphere via junctions
- Neutronic analysis of the European sodium cooled fast reactor with Monte Carlo code OpenMC
- Identification and tracing of radionuclides in low- and medium-activity liquid radwaste sources of G.A. Siwabessy reactor
- Performance evaluation of a currently in-use dry storage cask design for spent accident tolerant fuel loading case under normal operation condition
- Optimization of divertor design for Pakistan spherical tokamak
- Role of impurity and thermal noise on the radiation sources in ITER using DT fuel
- An investigation of multistream plate-fin heat exchanger modelling and design: a review
- Ensuring safety of new, advanced small modular reactors for fundamental safety and with an optimal main heat transport systems configuration
- Study on calculation model and risk area of radionuclide diffusion in coastal waters under nuclear leakage accidents with different levels
- Optimization of 200 MWt HTGR with ThUN-based fuel and zirconium carbide TRISO layer
- Experimental study on boiling heat transfer of γ-Fe2O3 nanofluids on a downward heated surface
- Evaluating the influence of radial power heterogeneity of fuel rod on its temperature in an accelerator driven subcritical system
- Heat transfer enhancement of heat exchanger using rectangular channel with cavities
- Calendar of events
