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Constant Pressure Calorimetry

Constant Pressure Calorimetry

Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...

Constant Volume Calorimetry

Constant Volume Calorimetry

Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at constant (atmospheric) pressure and are convenient to measure heat flow (or enthalpy change) accompanying processes that occur in solution at constant pressure. A different type of calorimeter that operates at constant volume, colloquially known as a bomb calorimeter, is used to measure the energy produced by reactions that yield large amounts of heat and...

Calorimetry

Calorimetry

When objects at different temperatures are placed in contact with each other but isolated from everything else, they attain thermal equilibrium. A container that prevents heat transfer in or out is called a calorimeter, and the use of a calorimeter to make measurements is called calorimetry. Generally, these measurements involve heat or specific heat capacity. The term "calorimetry problem" is used for any problem where the specified objects are thermally isolated from their...

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Related Experiment Video

Updated: Apr 13, 2026

Thermal Measurement Techniques in Analytical Microfluidic Devices

Thermal Measurement Techniques in Analytical Microfluidic Devices

Published on: June 3, 2015

A continuous flow microfluidic calorimeter: 3-D numerical modeling with aqueous reactants.

Mehmet A Sen¹, Gregory J Kowalski¹, Jason Fiering²

¹Northeastern University, Department of Mechanical and Industrial Engineering, 360 Hungtington Avenue, 334 Snell Engineering Center, Boston, MA 02115, USA.

Thermochimica Acta

|May 5, 2015

Summary

This summary is machine-generated.

Computational fluid dynamics modeling of a microchannel reactor shows temperature uniformity across the channel thickness. This study suggests potential for microcalorimeter development using optical nanohole array sensors for reaction enthalpy determination.

Keywords:

Coflow reactor Enthalpy of reaction Laminar flow interface Microcalorimeter Microfluidic Nanohole array

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Millifluidics for Chemical Synthesis and Time-resolved Mechanistic Studies

Millifluidics for Chemical Synthesis and Time-resolved Mechanistic Studies

Published on: November 27, 2013

Area of Science:

Chemical Engineering
Computational Fluid Dynamics
Heat Transfer

Background:

Microchannel reactors are increasingly used for chemical synthesis and analysis.
Understanding heat and mass transfer is crucial for optimizing reactor performance.
Accurate temperature measurement is essential for determining reaction energetics.

Purpose of the Study:

To computationally analyze the reacting flow field, species diffusion, and heat transfer in a coflow microchannel reactor.
To investigate the impact of thermal boundary layers and substrate material on temperature distribution.
To assess the feasibility of using this configuration for microcalorimetry.

Main Methods:

Utilized the Fluent computational fluid dynamics package to solve Navier-Stokes, mass transport, and energy equations.
Incorporated an energy model including enthalpy of reaction as a non-uniform heat source.
Validated the energy model through control volume energy balance calculations.

Main Results:

Temperature was found to be nearly uniform across the channel thickness, normal to the substrate.
Heat transfer was predominantly influenced by the glass substrate material.
Numerical results indicate that surface temperature measurements are representative of the average temperature.

Conclusions:

The microchannel reactor configuration exhibits favorable temperature uniformity for sensing applications.
A microcalorimeter could be developed based on this design.
Optical nanohole array sensors possess adequate spatial resolution for determining enthalpy of reaction.