7 research outputs found
Crystallization-Induced Fouling during Boiling: Formation Mechanisms to Mitigation Approaches
Boiling is significantly
altered by the presence of dissolved salts.
In particular, salts whose solubility decreases with temperature have
the tendency to crystallize and adhere to the heat transfer surface
and adversely affect the thermal performance. Scaling due to the precipitation
of such salts poses serious operational and safety challenges in several
practical applications, including heat exchangers, pipelines, and
desalination. Here, we study the effect of dissolved salts on the
dynamics of pool boiling and its impact on the heat transfer coefficient
and critical heat flux (CHF). We find that even undersaturated conditions
can lead to crystallization and scale buildup on the boiling surface
and dramatically lower heat transfer performance. For example, the
CHF for a salt solution that is 75% of the saturation concentration
is found to be at least 2 times lower than that for deionized water.
Using simultaneous high-speed optical and infrared imaging, we determine
the interdependence between crystallization-induced scale formation
and bubble evolution dynamics, including bubble nucleation, growth,
and departure. We find that salt crystallizes in a ācoffee-ringā
pattern due to evaporation at the contact line of the bubble. On the
basis of the role of the microlayer and triple contact line on scale
formation, we propose manipulating surface wettability as a means
to avoid scale formation and the associated decrease in the heat transfer
coefficient. Surfaces with hybrid wettability are demonstrated as
a means to mitigate the reduction in the heat transfer coefficient
and CHF in the presence of dissolved salts
Enhancing the Performance of Viscous Electrode-Based Flow Batteries Using Lubricant-Impregnated Surfaces
Redox
flow batteries are a promising technology that can potentially
meet the large-scale grid storage needs of renewable power sources.
Today, most redox flow batteries are based on aqueous solutions with
low cell voltages and low energy densities that lead to significant
costs from hardware and balance-of-plant. Nonaqueous electrochemical
couples offer higher cell voltages and higher energy densities and
can reduce system-level costs but tend toward higher viscosities and
can exhibit non-Newtonian rheology that increases the power required
to drive flow. This work uses lubricant-impregnated surfaces (LIS)
to promote flow in electrochemical systems and outlines their design
based on interfacial thermodynamics and electrochemical stability.
We demonstrate up to 86% mechanical power savings at low flow rates
for LIS compared to conventional surfaces for a lithium polysulfide
flow electrode in a half-cell flow battery configuration. The measured
specific charge capacity of ā¼800 mAh/(gĀ·S) is a 4-fold
increase over previous work
Enhancing the Performance of Viscous Electrode-Based Flow Batteries Using Lubricant-Impregnated Surfaces
Redox
flow batteries are a promising technology that can potentially
meet the large-scale grid storage needs of renewable power sources.
Today, most redox flow batteries are based on aqueous solutions with
low cell voltages and low energy densities that lead to significant
costs from hardware and balance-of-plant. Nonaqueous electrochemical
couples offer higher cell voltages and higher energy densities and
can reduce system-level costs but tend toward higher viscosities and
can exhibit non-Newtonian rheology that increases the power required
to drive flow. This work uses lubricant-impregnated surfaces (LIS)
to promote flow in electrochemical systems and outlines their design
based on interfacial thermodynamics and electrochemical stability.
We demonstrate up to 86% mechanical power savings at low flow rates
for LIS compared to conventional surfaces for a lithium polysulfide
flow electrode in a half-cell flow battery configuration. The measured
specific charge capacity of ā¼800 mAh/(gĀ·S) is a 4-fold
increase over previous work
Enhancing the Performance of Viscous Electrode-Based Flow Batteries Using Lubricant-Impregnated Surfaces
Redox
flow batteries are a promising technology that can potentially
meet the large-scale grid storage needs of renewable power sources.
Today, most redox flow batteries are based on aqueous solutions with
low cell voltages and low energy densities that lead to significant
costs from hardware and balance-of-plant. Nonaqueous electrochemical
couples offer higher cell voltages and higher energy densities and
can reduce system-level costs but tend toward higher viscosities and
can exhibit non-Newtonian rheology that increases the power required
to drive flow. This work uses lubricant-impregnated surfaces (LIS)
to promote flow in electrochemical systems and outlines their design
based on interfacial thermodynamics and electrochemical stability.
We demonstrate up to 86% mechanical power savings at low flow rates
for LIS compared to conventional surfaces for a lithium polysulfide
flow electrode in a half-cell flow battery configuration. The measured
specific charge capacity of ā¼800 mAh/(gĀ·S) is a 4-fold
increase over previous work
Enhancing the Performance of Viscous Electrode-Based Flow Batteries Using Lubricant-Impregnated Surfaces
Redox
flow batteries are a promising technology that can potentially
meet the large-scale grid storage needs of renewable power sources.
Today, most redox flow batteries are based on aqueous solutions with
low cell voltages and low energy densities that lead to significant
costs from hardware and balance-of-plant. Nonaqueous electrochemical
couples offer higher cell voltages and higher energy densities and
can reduce system-level costs but tend toward higher viscosities and
can exhibit non-Newtonian rheology that increases the power required
to drive flow. This work uses lubricant-impregnated surfaces (LIS)
to promote flow in electrochemical systems and outlines their design
based on interfacial thermodynamics and electrochemical stability.
We demonstrate up to 86% mechanical power savings at low flow rates
for LIS compared to conventional surfaces for a lithium polysulfide
flow electrode in a half-cell flow battery configuration. The measured
specific charge capacity of ā¼800 mAh/(gĀ·S) is a 4-fold
increase over previous work
Enhancing the Performance of Viscous Electrode-Based Flow Batteries Using Lubricant-Impregnated Surfaces
Redox
flow batteries are a promising technology that can potentially
meet the large-scale grid storage needs of renewable power sources.
Today, most redox flow batteries are based on aqueous solutions with
low cell voltages and low energy densities that lead to significant
costs from hardware and balance-of-plant. Nonaqueous electrochemical
couples offer higher cell voltages and higher energy densities and
can reduce system-level costs but tend toward higher viscosities and
can exhibit non-Newtonian rheology that increases the power required
to drive flow. This work uses lubricant-impregnated surfaces (LIS)
to promote flow in electrochemical systems and outlines their design
based on interfacial thermodynamics and electrochemical stability.
We demonstrate up to 86% mechanical power savings at low flow rates
for LIS compared to conventional surfaces for a lithium polysulfide
flow electrode in a half-cell flow battery configuration. The measured
specific charge capacity of ā¼800 mAh/(gĀ·S) is a 4-fold
increase over previous work
Enhancing the Performance of Viscous Electrode-Based Flow Batteries Using Lubricant-Impregnated Surfaces
Redox
flow batteries are a promising technology that can potentially
meet the large-scale grid storage needs of renewable power sources.
Today, most redox flow batteries are based on aqueous solutions with
low cell voltages and low energy densities that lead to significant
costs from hardware and balance-of-plant. Nonaqueous electrochemical
couples offer higher cell voltages and higher energy densities and
can reduce system-level costs but tend toward higher viscosities and
can exhibit non-Newtonian rheology that increases the power required
to drive flow. This work uses lubricant-impregnated surfaces (LIS)
to promote flow in electrochemical systems and outlines their design
based on interfacial thermodynamics and electrochemical stability.
We demonstrate up to 86% mechanical power savings at low flow rates
for LIS compared to conventional surfaces for a lithium polysulfide
flow electrode in a half-cell flow battery configuration. The measured
specific charge capacity of ā¼800 mAh/(gĀ·S) is a 4-fold
increase over previous work